Question

Assertion (A): Earthquake waves have been an important source of information about the interior of the earth.

Reason (R): Earthquake waves originate from the seismic focus.

Options

• Both A and R are true and R is the correct reason for A.

• Both A and R are true but R is not the correct reason for А.

• A is true and R is false.

• A is false and R is true.

Answer 1

Both A and R are true and R is the correct reason for A.

Explanation:

Earthquake waves have been important to study earth’s interior because these waves travel through the earth, revealing its internal structure. These waves originate at the seismic focus, the point within the earth where the earthquake starts. Hence, the origin of earthquake waves at the seismic focus explains their importance in studying the earth’s interior.