Question

Q. Assertion (A): Basalt is a fine grained and dark-coloured rock igneous rock which is formed below the earth's surface.

Reason (R): The rate of cooling and solidification of magma inside the earth is very low.

In the context of the above, which of these is correct?

• A.
  A is correct, and R is an appropriate explanation of A
• B.
  A is correct, but R is incorrect
• C.
  A is incorrect, but R is correct
• D.
  A is correct, and R is not appropriate explanation of A

Answer 1

The correct option is C

A is incorrect, but R is correct
Explanation:

Assertion (A) is incorrect: Basalt is a fine grained and dark-coloured rock igneous rock which is formed over the earth's surface. Only magma is formed beneath the earth's surface. Basalt is the most significant example of extrusive igneous rocks.

Reason (R) is correct: The rate of cooling and solidification of magma inside the earth is very low because of the extreme temperature inside the earth.