Q.

Which of the following caused radioactive pollution along the coast of Kerala?

A. Plutonium
B. Zinc
C. Thorium
D. Radium
Answer» C. Thorium
Explanation: Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
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