Rock Types - Geological Formations

An explanation of the geological processes which lead to the formation of different types of rock.

Earth Science - Geology - Learning Points.

There are three types of rock: sedimentary, igneous and metamorphic.

Sedimentary rock forms when deep layers of mineral and organic particles are compacted over millions of years, e.g sandstone.

Igneous rocks form when magma cools to a solid, e.g basalt.

Metamorphic rock is formed when rock is subject to heat and pressure, e.g. slate is produced from shale hardened as pressure and heat have rearranged the layers.
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