Question

The volcanic material in some cases reaches the surface while in some other instances it gets deposited within the rocks of the earth's crust. Give reason.

Answer 1

Answer:

• During volcanic eruptions, the lava released on cooling during volcanic eruptions grows into rocks that are igneous.
• The cooling can occur either when the surface is reached or while the lava is still in the part of the crust.

• The lava that cools in the various parts of the crust then forms igneous rocks.
• Cooling the lava on surface to form igneous rocks called “volcanic rocks”.
• The lava that cools in the crust to form igneous rocks called “plutonic rocks”.