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Question

Q. Consider the following statements with reference to interior of the Earth:

Which of the above statements is/are correct?

A

1 only
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B

1 and 3 only
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C

2 and 3 only
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D

1, 2 and 3
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Solution

The correct option is D
1, 2 and 3
Explanation:

Statement 1 is correct: There are three main sources of heat in the deep earth:
(1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.

Statements 2 and 3 are correct: The outer layer is the earth crust –the lithosphere consists of 2 parts – the upper part consists of granitic rocks and forms the continents which comprises silica and alumina which have a density of 2.7.

The lower part consists of basaltic rocks and forms the oceans which comprises of silica, iron and magnesium which has average density of 3.0

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