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Subjects

Geography

Evolution of the earth

In this Class 11 Geography topic from “The Origin and Evolution of the Earth,” students trace how Earth formed and changed over geological time. They learn about the early solar nebula, the separation of materials within the young planet, the development of the crust, atmosphere and oceans, and the gradual emergence of life. The topic connects major stages of Earth’s evolution with the geological processes that shaped its present structure.

Expert · Level 1 · 25 questions

Practice questions

01Movement of heavy metals to the centre and lighter silicates remaining above supports which high level explanation?

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02Why should solar wind and lightness of gases be studied together while explaining loss of the first atmosphere?

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03If outgassing from Earth's interior had not occurred what would be the biggest absence after the first atmosphere?

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04Which stage is causally misplaced in the process from water vapour to hydrosphere?

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05Why is chemical evolution considered a precondition for origin of life?

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06Development of early life in an atmosphere with low free oxygen strengthens which conclusion?

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07What is the most scientific reason for calling photosynthesis a turning point in atmospheric evolution?

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08Which causal chain best explains formation of the ozone layer?

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09In absence of ozone layer what would be the strongest selection pressure for land life?

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10Why is linking oxygen accumulation only with respiration incomplete at expert level?

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11What is the strongest argument for considering biosphere a late developing system?

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12Which major explanation fails if the sequence of lithosphere and hydrosphere is reversed?

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13What is the analytical reason for including the giant impact idea of the Moon in Earth's evolution?

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14If oceans were a medium of pre life chemistry why was their relation with atmosphere decisive?

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15Which is the most suitable example of two way relation between atmosphere and biosphere?

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16Presence of methane and ammonia on early Earth is linked with which expert conclusion?

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17If photosynthesis evolved late which chain would be delayed the most?

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18If Earth had a water source but no solid cool surface which stage would be obstructed?

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19Which is the correct pair of external and internal causes of early Earth's instability?

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20If outgassing occurred but little water vapour was released which later process would be most affected?

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21Why is explaining origin of life only by chemical evolution incomplete?

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22How did oxygen increase affect geographical expansion of life on Earth?

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23After biosphere appeared what new type of effect entered the Earth system?

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24If oceans had not formed what effect on atmospheric carbon dioxide balance was possible?

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25What is the main difference in required conditions for core formation and hydrosphere formation?

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