Question

Assertion (A): The upper part of the crust is called SIAL.

Reason (R): SIMA is a continuous layer.

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 A.

• A is true and R is false.

• A is false and R is true.

Answer 1

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

Explanation:

The upper part of the earth’s crust is called SIAL (rich in silica and aluminum), and the lower part is called SIMA (rich in silica and magnesium). SIMA forms a continuous layer beneath the crust. However, the fact that SIMA is a continuous layer is not the reason why the upper part of the crust is called SIAL. So, both statements are true, but R is not the correct reason for A.