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Rocks and stones are naturally occurring solids made up of minerals.
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The Earth's crust is made up of rock.
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Rocks have been used by humans for millions of years, from early tools and weapons through to various construction materials.
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There are three different types of rocks based on the way they form, igneous,sedimentary and metamorphic.
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When magma cools and solidifies it forms igneous rock.
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Examples of igneous rocks include granite, basalt, gabbro, obsidian and pumice. More igneous rock facts.
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Sediment deposited over time, often as layers at the bottom of lakes and oceans, forms sedimentary rocks.
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Examples of sedimentary rocks include sandstone, mudstone, flint, greywacke and chalk. More sedimentary rock facts.
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Extreme pressure and heat over time forms metamorphic rocks.
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Examples of metamorphic rocks include marble, quartzite, schist, granulite and slate. More metamorphic rock facts.
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The metamorphic rock marble is formed from the sedimentary rock limestone.
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The metamorphic rock granulite is formed from the igneous rock basalt.
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