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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.

Hard · Level 1 · 25 questions

TOPIC PRACTICE

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25 questions

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  1. Cooling allowed water vapour to condense into liquid water
  2. Cooling formed the Sun
  3. Cooling started red shift
  4. Cooling made planetesimals disappear
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  1. Separation of core and crust would become clearer
  2. Oceans would form earlier
  3. Separation of heavy and light materials would be weaker
  4. Ozone layer would form immediately
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  1. Density difference gravity and molten state
  2. Rainfall photosynthesis and ozone
  3. Solar wind condensation and oceans
  4. Biological evolution weathering and river erosion
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  1. Both had the same source
  2. The first was linked with light gases while the second came from internal outgassing
  3. The second formed only from modern plants
  4. The first was oxygen rich
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  1. The early atmosphere was stable and modern like
  2. Life on Earth was already complex
  3. Earth's early gaseous envelope was unstable
  4. Oceans had formed before gases
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  1. It was only about gas composition
  2. It was the main cause of core formation
  3. It was only a remnant of the first atmosphere
  4. It was a link to later hydrosphere formation
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  1. Long term retention of gases would become difficult
  2. Oxygen would immediately increase
  3. The core would come to the surface
  4. Oceans would become deeper first
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  1. Stopping of solar wind
  2. Accumulation of rainwater on the surface
  3. High accumulation of oxygen
  4. Complete development of ozone layer
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  1. Oceans sent all gases to space
  2. Oceans cooled the core
  3. Some gases dissolved in water and changed atmospheric proportions
  4. Ozone changed oceans into gas
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  1. They were completely oxygen rich
  2. They were only salt stores
  3. They controlled gravity
  4. They provided a liquid medium for chemicals to mix and react
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  1. Formation of simple organic substances was needed before life
  2. Human civilization had already formed
  3. Ozone made Earth first
  4. Oceans formed after life
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  1. Early organisms were like modern complex organisms
  2. Early organisms were simple and adapted to different energy conditions
  3. The ozone layer was already strong
  4. Earth had no water
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  1. It made the core metallic
  2. It dried oceans
  3. It changed gas composition through organisms
  4. It created solar wind
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  1. Ozone first made oxygen
  2. Oceans destroyed ozone
  3. Solar wind created photosynthesis
  4. Photosynthesis increased oxygen and oxygen formed ozone
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  1. There was not enough protection from ultraviolet radiation
  2. Gravity was zero
  3. Oceans did not exist
  4. The core was outside
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  1. Only formation of the Moon
  2. Only presence of solar wind
  3. Water solid surface favourable atmosphere and temperature balance
  4. Only metallic core
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  1. Hydrosphere formed the core
  2. Lithosphere is only gas
  3. Both have no mutual relation
  4. A cool solid surface provided a base for rainwater accumulation
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  1. Light gases then solar wind loss then outgassing then water and biological effects
  2. Photosynthesis then Earth formation then core
  3. Ozone then first atmosphere then oceans
  4. Human industry then first atmosphere then life
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  1. They were the main material of the core
  2. They also affected heat balance and gas dissolution
  3. They created solar wind
  4. They were unimportant because they were not the source of ozone
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  1. Possibility of early photosynthetic life would decrease
  2. Oxygen would increase immediately without life
  3. Ozone would become abundant earlier
  4. Core would create oxygen
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  1. Evidence of oxygen rich atmosphere like present
  2. Indication of primitive conditions with low free oxygen
  3. Evidence of complete ozone layer
  4. Abundance of land vegetation
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  1. Carbon dioxide formed the core
  2. Solar wind formed oceans
  3. Water vapour condensed causing rain and water accumulation
  4. Ozone turned water vapour into metal
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  1. It supported both molten condition and gas release
  2. It froze oceans immediately
  3. It started photosynthesis
  4. It stopped solar wind
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  1. Stable vegetation, calm oceans and an oxygen-rich atmosphere
  2. Frequent impacts, a molten surface, intense volcanism and gas release
  3. Advanced agriculture, developed river systems and stable soil
  4. A complete ozone layer, a modern atmosphere and human life
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  1. Early planetary evolution was calm and impact free
  2. Moon formed from life
  3. Large impacts had a role in early planetary evolution
  4. Ozone formed first then the Moon

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