Types of rock
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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.

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These are rocks formed by the cooling of molten rock (magma.)

Magma cools and solidifies forming igneous rocks

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Sedimentary Rocks are rocks formed when particles of sediment build up and are “cemented together” by the effect of pressure and minerals.

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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.