Rajasthan Board RBSE Class 11 Physical Geography Chapter 2 The Earth as a Planet
RBSE Class 11 Physical Geography Chapter 2 Text Book Questions
RBSE Class 11 Physical Geography Chapter 2 Multiple Choice Questions
Question 1.
Earth is positioned from the sun:
(a) at the fourth position
(b) at the second place
(c) at the third place
(d) at the first place
Answer:
(c) at the third place
Question 2.
The correct position of internal planets is:
(a) after Jupiter
(b) from Jupiter to Uranus
(c) from Saturn to Neptune
(d) from Mercury to Mars
Answer:
(d) from Mercury to Mars
Question 3.
Earth’s natural satellite
(a) moon
(b) titan
(c) aryabhatta
(d) moonlight
Answer:
(a) moon
Question 4.
The speed of light is:
(a) 4 lakh km/sec
(b) 3 lakh km/sec
(c) 3.6 lakh km/sec
(d) 4.3 lakh km/sec
Answer:
(b) 3 lakh km/sec
Question 5.
The highest temperature, density and pressure is found on Earth:
(a) near the earth’s surface
(b) in the middle of the earth
(c) in the atmosphere above the earth
(d) at the center of the Earth
Answer:
(d) at the center of the Earth
RBSE Class 11 Physical Geography Chapter 2 Very Short Answer Type Questions
Question 1.
What is the second name of the rocky circle?
Answer:
The second name of the rocky circle is lithosphere.
Question 2.
Which astronomer discovered the expansion of the universe?
Answer:
Edwin Hubble discovered the expansion of the universe.
Question 3.
What is Nebula?
Answer:
Clouds of dust and gases are called nebula.
Question 3.
What are ‘Asteroids’?
Answer:
Many rocky objects of small size are found between the orbits of planets Mars and Jupiter. These rocky bodies are called asteroids.
Question 4.
What is a ‘Dwarf Planet’?
Answer:
Such planets whose orbits are not circular or who take the orbit of any other planet and lack sufficient gravitational force, they are called dwarf planets.
For example:
Pluto, Cheron, Cerus 2003, UB 313.
RBSE Class 11 Physical Geography Chapter 2 Short Answer Type Questions
Question 1.
What is the Expanding Universe Hypothesis?
Answer:
The universal principle regarding the origin of the universe is the ‘Big Bang Theory’. This is called the expanded Universe hypothesis. According to this hypothesis, the universe is constantly expanding. Along with the passage of time, the distance between the galaxies is increasing. Scientists believe that the distance between the galaxies is constantly increasing. But the expansion of galaxies is not certified by observation.
Question 2.
What is the contribution of astronomer’Fred Hoyle’?
Answer:
Astronomer Fred Hoyle had rendered a steady state concept. According to this concept, the universe has remained the same at any time. Apart from this, he also collaborated with Little ton to present the novel concept. The burning of hydrogen in it led to the creation of heavy elements. Through the process of becoming a nova, the star’s light was told to grow millions more times than before.
Question 3.
Explain the difference between Terrestrial and Jovian planets.
Answer:
The following differences are found in the Terrestrial and Jovian planets:
| Shape | The terrestrial planets are smaller in size. | The Jovian planets are large in size. |
| 1. Distance from the sun | Terrestrial planets are at less distance from the sun. | Jovian planets are at more distance from the sun. |
| 2. Structure | The structure of the terrestrial planets is rocky. | The structure of the Jovian planets is mainly gaseous. |
| 3. Cooling time | Terrestrial planets take less time to cool down. | Jovian planets take more time to be cool. |
| 4. Number of satellites | The terrestrial planets have cooled down quickly, due to which the number of their satellites is less. | Jovian planets cooled off slowly due to which the number of their satellites is more. |
Question 4.
What is the composition of the internal structure of tlie earth?
Answer:
The presence of many substances is found in the internal structure of the earth. The three layers found in the earth are made up of a mixture of different substances. The formation of igneous rocks under the sea bottom is found in the construction of the upper layer (crust) of the Earth. In the continental plane, igneous and metamorphic rocks are found.
They mainly have the prominence of silica and aluminum. Also, acidic substances are found more. The layer of silica and magnesium substances is there in the lower layer of the crust,called sima in the intermediate section. In this, the alkaline substances are primarily found. The primacy of nickel and iron is mainly found in the inner most layers of the earth.
Question 5.
What is the Goldilocks Zone?
Answer:
Life on earth has been possible because the earth is at such a distance from the sun that ideal solar energy is received on its. This type of condition is known as ‘Goldilocks Zone’. Where there is a certain distance from the Sun, the presence of water is found on the planet. Life has been possible due to availability of water and favorable atmospheric conditions. Scientists are engaged in discovering conditions like Goldilocks so that the ideal conditions for life can also be found on other planets similar elsewhere in the universe, to Earth.
RBSE Class 11 Physical Geography Chapter 2 Essay Type Questions
Question 1.
Perform a critical discussion on the “Big Bang Theory”.
Answer:
Big Bang Theory:
Modern universally acceptable principle regarding the origin of the universe is the ‘Big Bang Theory’. It is also called the Expanded Universe Hypothesis, because this principle states that the universe is continuously expanding. The credit for propounding this principle goes to Edwin Hubble, who, on the basis of the evidence, proved that the universe is expanding, and over time, the galaxies are moving away from each other. The scientists have found that the distance between the galaxies cannot increasing but the expansion of galaxies cannot be proved practically.
Stages of the expansion of the universe:
According to the Big Bang theory, the expansion of the universe has occurred in the following three stages:
1. Materials that created the universe being concentrated at one place:
All the substances that created the universe were concentrated initially in the same place in the form of Singularity (Singular Atom) a tiny ball (singular atom). The volume of these subtle substances was almost zero and temperature and density was infinite.
2. The expansion of the universe at a rapid pace by the explosion process:
According to the Big Bang theory, these small particles exploded at a rapid pace with the passage of time. The universe expanded at a rapid pace due to this explosion. This extension continues even today. The phenomenon of expansion happened at a very fast pace in the smallest part of a second. After this, the speed of expansion slowed down. The first atom was formed in the first three minutes of the beginning of Big Bang. This incident of explosion took place almost 14 billion years ago.
3. The rapid decrease in temperature:
Due to the occurrence of the Big Bang phenomenon, rapid decrease in temperature took place during three million years. It fell to about 4200°C and the production of atomic substances resulted This led to the formation of a transparent universe.
In a nutshell, the galaxies in the universe were created by this process. Galaxies were small in the beginning. The distances between them were less. The tiny balls located in the middle of the galaxies due to the Big Bang process triggered the spread of the distance between the galaxies, i.e. the universe started expanding.
Thus the planets formed due to the explosion of stars and the condensation of matter. This process was repeated on planets and satellites were formed. Thus the solar system and the planets were formed.
Criticism:
The following criticisms have been made for this principle:
1. According to this principle, the distance between the galaxies is increasing but astronomical observation does not prove the expansion of galaxies.
2. The astronomer Hoyle has rendered the ‘steady state concept’, according to which, the universe has remained the same at any time. Although, there are so many evidences today on which basis the scholars are further studying the universe.
Question 2.
Explain the’Solar System’.
Answer:
Solar System:
The Sun and its celestial family are collectively known as the Solar System. The origin of the solar system is from the solar nebula. There are eight planets in our solar system. Our solar system consists of sun (star), 8 planets, 183 satellites, millions of small objects such as asteroids, comets, meters and large amount of dust and gases. Members related to the Solar System have been described as follows:
Planets:
Planets are astronomical bodies, which revolve around the Sun in their fixed orbits. The planets do not have their own light. They reflect sunlight. Planets rotate on their axis.
Classification of planets:
The number of planets in the solar system is 8. In order of distance from the Sun, their names are as follows: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus (Arun) and Neptune (Varun). So far, Pluto was considered to be a planet, but the International Astronomical Organization defined it as a dwarf planet in its meeting in August 2006. Planets of the Solar System have been divided into two parts:
1. Inner Planets:
The planets located between the asteroid belt and the Sun, Mercury, Venus, Earth and Mars are called internal planets. They are also called terrestrial planets. These four planets are as solid as the Earth and are made of rocky minerals and metals with relatively high density.
2. Outer Planets:
Planets located outside the asteroid belt Jupiter, Saturn, Uranus, and Neptune are called outer planets. Due to Jupiter, these planets are also called Jovian planets. These planets are relatively large in size. Their density is relatively low. All these planets are made mainly of liquid and gaseous matter. Hydrogen and helium are primarily present in gases.
Stages of the formation and development of planets:
All the planets formed around 4.6 billion years ago. Different stages of planetary formation and development are the following:
1. The evaporation of gas and dust cells:
Stars are found in the form of a bunch of gas in the nebula. Gravitational force has created gaseous core in the gaseous clouds in these twisted bundles. The spinning wheel of gas and dust evolved around these gaseous cores.
2. The development of the planetesimals:
Combination of gaseous clouds in the second stage of planetary development started and the material covering the core evolved into small balls. These small shells evolved in the form of germs through inter – atomic attraction. These planetesimals were added as a result of gravitational force.
3. Creation of planets from big bodies:
On the agglomeration of many small such balls in the final stage of the development, various large bodies were formed in the form of planets. In this way, the planets were evolved.
Question 3.
Explain geological time scales.
Answer:
Geological Time Scales:
Geological history from the origin of the earth to the present is called geological time measurement / table. Under this, the origin and development of different animals, birds and vegetation on the surface is studied by dividing them into different times and periods in a fixed order. The length of time from the origin of the earth to the present period is very long. So this time it has been divided into Eons, Mahakalpa, Kalpa and Era. Based on the specific geological features found on the earth’s surface, the history of the earth has been divided, which is as follows:
RBSE Class 11 Physical Geography Chapter 2 Other Important Questions
RBSE Class 11 Physical Geography Chapter 2 Multiple Choice Questions
Question 1.
The following is the living planet:
(a) Jupiter
(b) Mars
(c) Earth
(d) Saturn
Answer:
(c) Earth
Question 2.
When did Laplace prepare his Nebular hypothesis?
(a) in 1750
(b) in 1765
(c) in 1785
(d) in 1796
Answer:
(d) in 1796
Question 3.
What was the name of the concept of James Jeans?
(a) Fiasco Zodiac hypothesis
(b) Nebula hypothesis
(c) Tidal hypothesis
(d) Interstellar Dust hypothesis
Answer:
(c) Tidal hypothesis
Question 4.
Which gas was found in the highest amount in the initial phase?
(a) Nitrogen
(b) Hydrogen
(c) Helium
(d) Oxygen
Answer:
(b) Hydrogen
Question 5.
Who is the exponent of the Big Bang Theory?
(a) Laplace
(b) Count
(c) Otto Schmi
(d) Edwin Hubble
Answer:
(d) Edwin Hubble
Question 6.
When did the formation of the stars begin?
(a) 2 to 3 billion years ago
(b) 5 to 6 billion years ago
(c) 7 to 8 billion years ago
(d) 9 to 10 billion years ago
Answer:
(b) 5 to 6 billion years ago
Question 7.
How many satellites are currently there in our solar system?
(a) 163
(b) 174
(c) 183
(d) 192
Answer:
(c) 183
Question 8.
The following is a Jovian planet:
(a) Pluto
(b) Saturn
(c) Earth
(d) Mars
Answer:
(b) Saturn
Question 9.
How many natural satellites does Pluto have?
(a) 2
(b) 4
(c) 5
(d) 7
Answer:
(c) 5
Question 10.
What is the age of dinosaurs?
(a) the Cambrian era
(b) the Devonian era
(c) the Jurassic era
(d) the Eocene Age
Answer:
(c) the Jurassic era
Matching Type Questions
Question (i)
Match Column ‘A’ with Column ‘B’ in the following:
| Column A (Name of hypothesis) | Column B (Propounder) |
| (i) Gaseous hypothesis | (a) Otto Schmidt |
| (ii) Nebula hypothesis | (b) James Jeans |
| (iii)Planetesimal hypothesis | (c) Kant |
| (iv) Tidal hypothesis | (d) Laplace |
| (v) Inter – stellar dust hypothesis | (e) Chamberlain |
Answers:
- (c)
- (d)
- (e)
- (b)
- (a)
Question (ii)
Match column ‘A’ with column ‘B’ in the following:
| Column A (Name of planet) | Column B (Number of satellites) |
| (i) Earth | (a) 14 |
| (ii) Mars | (b) 27 |
| (iii) Jupiter | (c) 1 |
| (iv) Saturn | (d) 2 |
| (v) Uranus | (e) 62 |
| (vi) Neptune | (f) 67 |
Answers:
- (c)
- (d)
- (f)
- (e)
- (b)
- (a)
RBSE Class 11 Physical Geography Chapter 2 Very Short Type Questions
Question 1.
What is a planet?
Answer:
Planet is such a celestial body, which revolves around a massive star.
For example:
8 planets revolving around the Sun in our solar system.
Question 2.
Who made the amendment in the concept of Kant?
Answer:
Laplace made the amendment in the concept of Kant.
Question 3.
What was the revision in the Nebular hypothesis by Karl Weizascar?
Answer:
Karl Weizascar considered the Sun surrounded by a solar nebula that was made mainly of hydrogen, helium and dust. The friction of these particles was thought to be the reason of the creation of the planets by a flat screen process.
Question 4.
When and how was the production of first atomic substance done?
Answer:
The first atomic material was formed under the initial three minutes of beginning of the the big bang.
Question 5.
How did the universe become transparent?
Answer:
After 3 million years of the Big Bang incident, the temperature fell to 4200°C and atomic material was formed, due to which the universe became transparent.
Question 6.
How were the stars formed?
Answer:
Nebula was formed from the storage of gas clouds. In this growing nebula, the strings of the gas evolved. These strings became increasingly denser and finally created the stars.
Question 7.
What does light year mean?
Answer:
Light year is a unit of astronomical distance equivalent to the distance which light travels in one year.
Question 8.
Which are the eight planets of the Solar System?
Answer:
There are eight planets of the Solar System – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Question 9.
What are the inner (terrestrial) planets?
Answer:
Mercury, Venus, Earth and Mars that are near the Sun are called inner or terrestrial planets.
Question 10.
Which are the outer or Jovian planets?
Answer:
Jupiter, Saturn, Uranus and Neptune that are located away from the Sun are called outer or Jovian planets.
Question 11.
Why did terrestrial planets originate near the Sun?
Answer:
The main reason for terrestrial planets originating near the sun was excessive temperature due to which the gases did not condense.
Question 12.
Why has Pluto been declared a dwarf planet?
Answer:
Pluto is a celestial body which has no circular cell, it lacks enough gravitational force and it rotates in the orbit of another planet. Therefore, it has been declared a dwarf planet.
Question 13.
What does ‘The Big Split’ mean?
Answer:
According to some scholars, the origin of the Moon in the form of Earth’s satellite is the result of a major collision, which is called ‘The Big Splat’.
Question 14.
What was the condition of the earth in the beginning?
Answer:
Initially, the earth was rocky, hot and barren, and its atmosphere was sparse, which was made of hydrogen and helium.
Question 15.
How is the history of the earth divided into the Eras?
Answer:
The history of the earth is divided into four Eras:
- Cainozoic.
- Mesozoic.
- Palaeozoic.
- Pre Cambrian.
Question 16.
How is the history of Earth divided?
Answer:
Earth’s geological history is divided into four elements, the third eclipse, the Cretaceous, the Jurassic, the Triassic, the Parmian, the Carboniferous, the Devonion, the Silurian, the Evolution of the Cambrian.
Question 17.
How are the parts of the Palaeozoic are divided?
Answer:
The Palaeozoic is divided into Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian Period.
Question 18.
What does the differentiation mean?
Answer:
The process of separation of materials of light and heavy density found in the Earth is called differentiation.
Question 19.
What are the layers in the internal structure of the earth?
Answer:
Layers called Crust, Mantle and Core are found when going from top to bottom in the internal structure of the Earth.
Question 20.
What does the term caudal star or comets mean?
Answer:
The celestial bodies revolving around the Sun in their fixed elliptical orbit, due to heat, disperse the substances and gases in the opposite direction of the Sun, due to which a tail is formed, such stars are called caudal stars or comets.
Question 21.
What are the three dimensions of the present atmosphere?
Answer:
The present atmospheric erosion of primordial gases, co-operation in the development of water vents of water vapor and the process of photosynthesis of the biosphere is included in the three dimensions of the atmosphere.
Question 22.
How has the emergence of the atmosphere taken place?
Answer:
During the cooling and differentiation of the Earth, many gases and water vapor came out from the inner part of the Earth. That is how present day atmosphere has emerged.
Question 23.
How did the oceans form?
Answer:
On the surface of the earth, the rain water started gathering in the troughs and thus the oceans were formed.
RBSE Class 11 Physical Geography Chapter 2 Short Answer Type Questions (SA-I)
Question 1.
Describe the characteristics of planet Earth.
Answer:
Earth is a unique planet of the Solar System. This planet is different from other planets, and it has the following characteristics:
- Earth is a living planet of the Solar System. It enjoys listening to the music of life.
- Earth is the only planet in which water is found in liquid state.
- The atmosphere is found on earth.
- It lies in the Goldilocks zone.
Question 2.
How did the origin and evolution of the earth take place?
Answer:
The origin of the earth took place approximately 4600 million years ago. Initially, the earth was rocky, hot and barren. Its atmosphere was sparse, which was made of hydrogen and helium gases. It was very different from today’s Earth’s atmosphere. With many events and actions, this rocky, deserted and warn! earth has turned into a beautiful planet. About 380 million years ago, life originated on this planet. The structure of the earth is spherical, whose outer part has less density and the inner part has more density.
Question 3.
What are the concepts presented in relation to the origin of the Earth?
Answer:
Singular and dualistic concepts are presented in the context of the origin of the earth. Including the Kant’s Gaseous hypothesis, nebula hypothesis of Laplace, the planetesinal hypothesis of Chamberlain and Molton, the tidal hypothesis of James Jeans, the Inter – stellar dust hypothesis of Otto Schmi the universe’s extended approach of Edwin Hubble.
Question 4.
What is Binary theory?
Answer:
The theory or hypothesis related to the origin of the Earth, from two or more stars, which is believed to be the source of the solar system and Earth, is called Binary theory. According to this principle, the formation of the solar system is believed to be by the second transitory star, near the sun. Most hypotheses of this class were rendered in the beginning of the twentieth century. The concepts of scientists such as Chamberlain and Molton, James Jeans, Jeffrey, Russell, etc. are included under this hypothesis.
Question 5.
The formation of galaxies is a long process. How? Explain.
Answer:
Distribution of energy and substances in the early universe was not the same. Variation in density of the gravitational forces came from initial variation, which resulted in the accumulation of substances. This agglomeration of substances is the basis for the development of galaxies. A galaxy is a group of innumerable stars. Galaxies are highly extensive. They range in thousands of light years. The formation of a galaxy begins with the accumulation of huge clouds formed by hydrogen gas.
Question 6.
Describe the features of the terrestrial planets. OR Describe the features of inner planets.
Answer:
The terrestrial (inner) planets have the following characteristics:
- The formation of terrestrial planets has taken place near the star, the sun.
- The condensation of gases in these planets has not been done completely.
- Terrestrial planets appear smaller in size.
- Gravitational force of the terrestrial (inner) planets is less.
- Satellites of terrestrial planets are less in number.
Question 7.
State the features of Jovian planets.
Or
What are the features found in outer planets?
Answer:
Jovian (outer) planets have the following characteristics:
- Jovian planets are found more far away from the Sun.
- On these planets, thick clouds of gases are found.
- Jovian planets are large in size.
- More gravitational force is found in Jovian planets.
- The number of satellites found in these planets is more.
Question 8.
How did the moon originate?
Answer:
The Earth’s satellite moon is considered to be formed due to a major collision. This collision is called ‘The Big Splat’. After some time after the formation of the Earth, a part of the size of 1 to 3 times the size of Mars was broken and scattered into space. This substance, which was separated from the site of collision, started moving around in the earth’s orbit and became the present day moon. The occurrence of this phenomenon of origin of the moon has been estimated to have taken place approximately 4.44 billion years ago.
Question 9.
Describe the characteristics of the Comets.
Or
How are the Comets flying celestial bodies?
Answer:
The Comets are the most attractive celestial bodies of our solar system. They have the following characteristics:
- They revolve around the Sun in their fixed elliptical orbit.
- Some of these comets are millions of kilometers long, and they take hundreds of years to come close to the sun.
- The nuclei in them is solid and rocky.
- In these, a tail is formed with the effect of solar winds.
- Their length can be up to millions of kilometers.
- According to some scientists, water and life on earth has been possible due to comets.
Question 10.
State the characteristics of meteorites.
Answer:
The following are the characteristics of meteors:
- They come from the sky on the surface as fire showers.
- In the event of their size being larger, they collide like a bomb on the earth’s surface.
- Meteorites are made up of many minerals.
- They help in solving the mysterious aspects of the solar system.
- Lakes have been constructed in the craters made from their impact on ground.
Question 11.
Name the major states of the development of the atmosphere.
Answer:
The development of the present atmosphere has taken place in the following three stages:
1. First stage:
In this stage of development of the present atmosphere, the primordial atmospheric gases decreased.
2. Second stage:
In this stage, steam and water vapor was emitted from Earth, which contributed to the development of the atmosphere.
3. Third stage:
In this stage, the structure of the atmosphere was modified by the photosynthesis process of the biosphere and molecular composition of atomic gases.
RBSE Class 11 Physical Geography Chapter 2 Short Answer Type Questions (SA-II)
Question 1.
How did the formation and evolution of planets take place?
Answer:
Formation of planets took place in the following manner:
1. The stars are a bunch of gas inside the nebula. In these twisted herds, the gravitational force created a core in the gas cloud and rotating discs of gas and dust were developed around this gaseous core.
2. The condensation of the gaseous began in the next stage and the material covering the core developed into planetesimals by the process of shell agglomeration (mutual attraction in molecules). Large bodies began to form by the action of collision and as a result of the force of gravity they became interconnected. The large number of small masses coalsced to form planetoids.
3. In the final stage, when these many small planetoids were merged, some large bodies took the form of planets.
Question 2.
Summarize the development of the earth’s crust.
Answer:
The structure of the planetesimals and other celestial bodies is mostly from a mixture of dense and light substances. The planetesimals were particles scattered in the universe before the origin of the planets. Other planets including the Earth were formed by the gathering of these planetesimals. As these substances accumulated due to the force of gravity, these collective bodies produced excessive heat.
Due to excessive heat, the earth partially converted into liquid state. Due to excessive temperature, stratification of light and heavy materials began. Heavy substances moved towards the center of the earth and the lighter matter started coming towards the outer periphery. These substances cooled over time, and converted into solid form and became smaller in size. In the end, they developed into the earth’s lithosphere.
Question 3.
Explain the evolution of the atmosphere.
Answer:
Evolution of the atmosphere:
Nitrogen and oxygen are the major contributor gases to the current structure of the Earth’s atmosphere. There are three states of development of the present atmosphere. The erosion of the primordial atmospheric gases took place in its first stage. In the second stage, steam and water vapor was emitted from inside the Earth and contributed to the development of the atmosphere.
In the end, the structure of the atmosphere was modified by the photosynthesis process of the biosphere. The initial atmosphere in which hydrogen and helium was abundant was removed from the earth due to solar winds. This happened not only on earth but on all terrestrial planets, that is, because of the effect of the solar winds, the primordial atmosphere was either pushed away or eliminated. This was the final stage of the development of the atmosphere.
Question 4.
How were the oceans, formed? Explain.
Answer:
In the early atmosphere of the Earth, water vapors, and gases nitrogen, carbon dioxide, methane and ammonia were in high concentration, and the amount of oxygen was quite less in the atmosphere. With constant volcanic eruptions on the ground, the atmosphere changed. The amount of water vapor and various gases started to grow rapidly. Condensation of water vapor started with the cooling of the earth.
Due to the presence of carbon dioxide present in the atmosphere in the rain water, the temperature decreased further. As a result, more condensation started and excessive rainfall occurred on the ground. On the surface of the earth, the rain water started to accumulate in the troughs and the oceans were formed. All the oceans present on the Earth were created approximately 500 million years earlier than the origin of life on the Earth, on which the life developed later.
Question 5.
How did life originate on earth? Explain.
Answer:
The final stage of the origin of the earth is related to the origin and development of life. The initial atmosphere of the Earth, of course, was not conducive to the development of life. Modern scientists, say, a kind of chemical reaction is responsible for the origin of life. This grouping was like repeating itself (was able to rebuild) and could transform the inanimate substances into a living entity.
The signs of life on our planet are in the form of fossils found in rocks of different times. The microscopic structure found in 3000 million – year – old geological formations is similar to the structure of today’s algae. It can be imagined, that before that, simple-structured algae were present. It is believed that the development of life began almost 3800 million years ago.
RBSE Class 11 Physical Geography Chapter 2 Essay Type Questions
Question 1.
The Earth is a unique planet of the Solar System. Explain its features.
Or
Explain the importance of Earth.
Or
The Earth is the living planet. How? Explain.
Answer:
The Earth is a major planet of the Solar System. It is at the third place from the Sun in sequence. Earth is geographically and geologically a living planet, where life is heard and seen as compared to other planets. There is a lack of adequate proof of life anywhere else than the Earth. Earth is a planet that supports life due to a certain distance from the Sun and ideal solar energy received. Due to a certain distance from the Sun, water is found in the fluid state on this planet.
The atmospheric conditions on earth are perfectly suited for the biological community. Because of the presence of humans on earth, all the facts are studied in the human context. The conjunction of human, animal and plant communities on earth is one of its main singularities, which is not found on any other planet. There are various types of seasonal events on earth. The formation of seasons and the formation of a variety of conditions generate a fascinating panoramic view on Earth.
The unmatched adjustment of human activity and natural environment and the unmatched variation of the culture that is found on the earth reflects an incomprehensible situation in itself. Due to the huge volume of water found on Earth, it is also named as the “Blue Planet”. Various species of organisms, their mutual activities create a dream form on Earth. Due to all these conditions, the Earth has become a unique, spectacular and attractive planet in comparison to all other planets in the Solar System.