1. Types of Rocks There are three main types of rocks:
Igneous - formed when molten rock cools.
Sedimentary – formed by the “cementing together” of small grains of sediment.
Metamorphic – rocks changed by the effect of heat and pressure.

2. Igneous Rocks
These are rocks formed by the cooling of molten rock (magma.)
magma
volcano
Magma cools and solidifies forming igneous rocks

3. Sedimentary Rocks
Sedimentary Rocks are rocks formed when particles of sediment build up and are “cemented together” by the effect of pressure and minerals.
Getting older
sea
Fragments washed to the sea
Sedimentary
rocks
Rocks are broken
up by the action
of weather

4. Metamorphic Rocks
Metamorphic rocks are formed by the effect of heat and pressure on existing rocks.
This can greatly affect the hardness, texture or layer patterns of the rocks.
Magma
Pressure from surface rocks
metamorphic
rock
forming
here
heat

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