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CD3 Rocks and Metals Rocks and the Earth There are 3 main types of rock . These are sedimentary , metamorphic and igneous . Igneous rocks are formed by molten lava escaping from the mantle and cooling down to form solid , crystalline rock. The faster the new rock cools the smaller the crystals in the rock are. Eg Granite Sedimentary rocks are made when small chippings of rock accumulate on the seabed and are crushed together over thousands of years. These chippings are worn from rocks by wind, rain and ice , this is called erosion or weathering. The chippings are carried to the sea by rivers and streams. Eg sandstone Metamorphic rocks are formed when high temperatures or pressures act on sedimentary or igneous rocks changing them. Eg marble The earth is made up of four main layers. The inner and outer cores are in the middle and are made of iron. Outside the core there is a layer...

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