Which one of the following earthquake waves is more destructive?
(a) P-waves
(c) Surface waves
(b) S-waves
(d) None of the above
Life on the earth appeared around how many years before the present?
(a) 13.7 billion
(c) 4.6 billion
(b) 3.8 million
(d) 3.8 billion
Which one of the following is not related to the formation or modification
of the present atmosphere?
(a) Solar winds
(c) Degassing
(b) Differentiation
(d) Photosynthesis
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