___________ are hard and resistant to erosion.  

The magma does not reach the crust of the earth are called ___________.

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

___________ rocks are the first  to be formed.

__________ rocks are less affected by chemical weathering. 

___________ are formed from materials derived from other rocks.

____________ have a silica content between 65 to 85 percent.

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

_________ make extensive landforms.

___________ rocks are associated with volcanic activity.