____________ rocks do not contain fossils.

__________ are generally lack in iron and magnesium.

___________ rocks are the first  to be formed.

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

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

A __________ has no definite chemical composition.

__________ are also known as volcanic rocks.

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

_________ make extensive landforms.

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