name two types of materials that we get from rocks ?
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Rocks are usually grouped into three main groups: igneous rocks, metamorphic rocks and sedimentary rocks. Rocks form the Earth's outer solid layer, the crust. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed.
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Metals such as copper and lead are used a lot in buildings, mostly in pipes for water and gas. Homes can be built out of lots of different things – different types of rocks such as sandstone or granite or bricks made from clay. Cement used to hold bricks together is made using limestone, clay, shale and gypsum.
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