What are the major structural units of the earth? Give a brief account.
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Answer: The major structural units of the Earth's interior are:
(a) a solid inner core; (b) a liquid outer core; (c) a thick mantle; (d) a soft asthenosphere; which is in the upper mantle; and (e) a rigid lithosphere of which the upper part is called the crust and the lower part belongs to the upper mantle
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