Sedimentary rocks - Formed when sediments have settled at the bottom of a lake/river/ocean and been compressed for millions of years , Igneous rocks  - Formed when magma or lava cools and solidifies , Metamorphic rocks  - Formed by the effects of heat and pressure on other rocks , Small crystals - Are formed when magma cools quickly, Large crystals - Are formed when magma cools slowly , Sandstone - An example of a sedimentary rock , Marble - An example of a metamorphic rock , Obsidian - An example of an igneous rock ,

Rock types

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