Civil Services Prep

Prelims MCQ · Geography

With reference to the evolution of the Earth, consider the following statements:

  1. The primordial atmosphere of hydrogen and helium is believed to have been stripped away by solar winds.
  2. An early atmosphere produced from the Earth’s interior contained water vapour, nitrogen, carbon dioxide, methane and ammonia, but very little free oxygen.
  3. The oceans formed within about 500 million years of the formation of the Earth.
  4. Photosynthesis had evolved before life began to appear around 3,800 million years ago.

Which of the statements given above are correct?

  1. 1 and 2 only
  2. 2, 3 and 4 only
  3. 1, 2 and 3 only
  4. 1, 3 and 4 only
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