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Building Materials - Engineering

Q1:

The rocks which are formed due to cooling of magma at a considerable depth from earth's surface are called

A Plutonic rocks

B Hypabyssal rocks

C Volcanic rocks

D Igneous rocks.

ANS:A - Plutonic rocks

Igneous rocks are formed due to the solidification of molten magma laying below or above the earth's surface.

Extrusive igneous rocks:these rocks are formed due to the solidification of molten magma laying on the surface of earth eg basalt.

Intrusive igneous rocks. Rocks formed due to solidification of molten magma inside the crust.

1. Plutonic igneous rocks: rocks formed at considerable depth e.g granite.
2 Hypabyssal igneous rocks: rocks formed at moderate depth e.g dolerite.

A is the correct answer.