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Which one of the following is not related to the formation or modification of the present atmosphere ?
  • Solar winds
  • Differentiation
  • Degassing
  • Photosynthesis

B.

Differentiation
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Why are the terrestrial planets rocky?


The terrestrial planets are rocky because they are earth-like and are made up of rocks and metals and have relatively high densities.
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Which one of the following has the longest duration ?
  • Eons
  • Period
  • Era
  • Epoch

A.

Eons
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What is the basic difference in the arguments related to the origin of the earth given by :


(a) Kant and Laplace

(b) Chamberlain and Moulton?


The Nebular Hypothesis, as proposed by Immanuel Kant and later revised by Laplace in 1796 considered that the planets were formed out of a cloud of material associated with a youthful sun, which was slowly rotating while, in 1900, Chamberlain and Moulton considered that a wandering star approached the sun.

As a result, a cigar-shaped material separated from the solar surface. As the passing star moved away, the material separated from the sun, continued to revolve around the sun and it slowly condensed into planets.
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Which one of the following figures represents the age of the earth ?
  • 4.6 million years
  • 13.7 billion years
  • 4.6 billion years
  • 13.7 trillion years

C.

4.6 billion years
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