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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.

Expert · Level 1 · 25 questions

TOPIC PRACTICE

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25 questions

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  1. Internal layers formed by photosynthesis
  2. Density controlled internal organisation occurred
  3. Oceans formed the core
  4. Solar wind formed the crust
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  1. Because both explain ocean salinity
  2. Because light gases were removed more easily by solar wind
  3. Because both form ozone
  4. Because both add metal to core
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  1. Natural gas source for secondary atmosphere
  2. Density based core formation
  3. Effect of solar wind
  4. Existence of planetesimals
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  1. Condensation of water vapour
  2. Accumulation of rainwater
  3. Complex land life before oceans
  4. Water remaining on cool surface
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  1. It created the base of simple organic molecules
  2. It ended solar wind
  3. It brought the core outward
  4. It formed the Moon
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  1. Early life was like modern complex organisms
  2. Early life was simple and adapted to primitive conditions
  3. Ozone layer was already complete
  4. Land forests had already formed
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  1. It provided a biological source of free oxygen
  2. It increased gravity
  3. It made the core liquid
  4. It formed the first atmosphere
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  1. Rainfall then crust then ozone
  2. Photosynthesis then oxygen accumulation then ozone
  3. Core then water vapour then ozone
  4. Solar wind then oceans then ozone
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  1. Risk of intense ultraviolet radiation
  2. Gravity of core
  3. Ocean salinity
  4. Helium amount in first atmosphere
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  1. Because oxygen also opened the way for ozone protection and complex life
  2. Because oxygen has no relation with life
  3. Because oxygen created solar wind
  4. Because oxygen made the core metallic
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  1. Life first needed water solid surface favourable atmosphere and energy conditions
  2. Life first made the core
  3. Biosphere existed before the first atmosphere
  4. Life evolved in solar wind
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  1. Permanent accumulation of rainwater after the formation of a cool, solid surface
  2. Removal of early atmospheric gases by solar wind
  3. Rise of atmospheric oxygen by photosynthetic organisms
  4. Giant-impact hypothesis for the formation of the Moon
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  1. It shows the impact driven and dynamic nature of early planet formation
  2. It explains beginning of photosynthesis
  3. It gives chemical formula of hydrosphere
  4. It tells thickness of ozone layer
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  1. Atmospheric gases could dissolve in water and change chemical conditions
  2. Atmosphere turned core into oceans
  3. Oceans created solar wind
  4. Oceans ended gravity
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  1. Atmosphere supported life and life increased oxygen
  2. Core made biosphere and biosphere removed core
  3. Solar wind made life and life made solar wind
  4. Moon made atmosphere and atmosphere made Moon
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  1. Modern oxygen rich atmosphere already existed
  2. Primitive atmosphere had low free oxygen
  3. Ozone layer was fully developed
  4. Land forests had already spread
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  1. Oxygen accumulation ozone formation land life protection
  2. Core formation differentiation crust
  3. Solar wind first atmosphere loss
  4. Planetesimal accretion early heat
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  1. Permanent water accumulation and ocean formation
  2. Effect of solar wind
  3. Existence of gravity
  4. Accumulation of metals in core
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  1. Planetesimal impacts and internal heat
  2. Ozone and flowering plants
  3. Human cities and agriculture
  4. Glaciers and modern rivers
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  1. Condensation rainfall and hydrosphere formation
  2. Iron moving into core
  3. Removal of light gases by solar wind
  4. Giant impact of the Moon
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  1. Because suitable water temperature atmosphere and surface conditions were also needed
  2. Because chemical evolution had no importance
  3. Because life needed only solar wind
  4. Because life formed in core
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  1. Ozone formation reduced radiation risk on land areas
  2. Core came to surface
  3. Oceans ended immediately
  4. Gravity reduced to zero
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  1. Change in atmospheric composition by organisms
  2. Solar wind formation by core
  3. Ending of gravity by oceans
  4. Crust formation by Moon
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  1. Dissolution and removal into water would reduce
  2. Carbon dioxide would immediately become ozone
  3. Solar wind would make carbon dioxide
  4. Core would consume carbon dioxide
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  1. Density differentiation for core and cooling vapour and surface accumulation for hydrosphere
  2. Both formed only by photosynthesis
  3. Both formed only by solar wind
  4. Both formed only by modern life

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