Question

Assertion (A): Extinct volcanoes have not shown any activity for a long historic period.

Reason (R): The vent of these volcanoes have got closed with a plug.

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 and R is the correct reason for A.

Explanation:

Extinct volcanoes have not shown any activity for a long historic period (A) because their vents have got closed with a plug (R). This plug blocks the escape of magma and gases, thus stopping any further volcanic activity, making the volcano extinct.