The word 'Igneous' is derived from the  __________ word.

_________ is heavy and dark in colour.

_________ make extensive landforms.

A __________ has no definite chemical composition.

On the basis of chemical composition,igneous rocks are classified into _____________.

__________ rocks are not crystalline.

Based on their origin, the igneous rocks are classified into ________ types.

___________ are light in weight.

When the magma solidifies with in the earth's crust it cools is called ___________.

__________ may be exposed to earth's surface through continued erosion.