The Three Types of Rocks
The outer layer of the Earth is made up of different kinds of rocks.
These rocks all belong to one of three different types:
	igneous, sedimentary and metamorphic.
Igneous Rocks	Sedimentary Rocks	Metamorphic Rocks
Igneous rocks are made	Sedimentary rocks are formed	Metamorphic rocks are
from hot, liquid rock	when layers of worn fragments	made when some of the
which is found deep	of rock and remains of plants	other rocks are pushed
inside the Earth.	and animals are pressed together.	back down under the
		surface and are changed
		by pressure and heat.
	Examples
granite,	chalk,	slate,
basalt.	limestone,	marble.
	sandstone.