The primary source of heat inside the Earth's interior is:
(a) Solar radiation
(b) Decay of radioactive elements
(c) Friction due to plate movement
(d) Volcanic activity

Question

The primary source of heat inside the Earth's interior is:
(a) Solar radiation
(b) Decay of radioactive elements
(c) Friction due to plate movement
(d) Volcanic activity

ONLiNE UPSC · Accepted Answer

Radioactive Decay: The Earth contains radioactive elements like uranium, thorium, and potassium. As these elements decay, they release heat energy. This is the primary source of heat that keeps the Earth's interior warm.

Earth's Interior

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M Question 1	⏱ 0
The primary source of heat inside the Earth's interior is: (a) Solar radiation (b) Decay of radioactive elements (c) Friction due to plate movement (d) Volcanic activity