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Extrusive rocks

If the magma is erupted to the surface as lava, the resulting rock is called extrusive. Extrusive rocks can be divided into three types: basalt, rhyolite or andesite, depending upon whether it is a basic, acidic or intermediate rock, respectively.

If the magma does not reach the surface as lava, the resulting rock beneath is called intrusive.

This table shows the different kinds of igneous rocks.

Go to a listing of Rocks by mineral group

Extrusive rocks

If the magma is erupted to the surface as lava, the resulting rock is called extrusive. There are three kinds of extrusive rock: basalt, rhyolite or andesite.

If the magma does not reach the surface as lava, the resulting rock is called intrusive.

This table shows the different kinds of igneous rocks.

Go to a listing of Rocks by mineral group

Extrusive rocks

If the magma is erupted to the surface as lava, the resulting rock is called extrusive. Volcanoes are made of extrusive rocks. Basalt is a very common extrusive rock.

If the magma does not reach the surface, the resulting rock is called intrusive.

This table shows the different kinds of igneous rocks.

Go to a listing of Rocks by mineral group