Igneous rocks are formed - when magma cools and solidifies., Examples of igneous rocks - include basalt and granite., Metamorphic rocks are formed - by pressure and heat deep under the Earth's surface., Examples of metamorphic rocks - include marble and slate, Sedimentary rocks are formed - by sediment that is deposited usually as layers at the bottom of lakes and oceans., Examples of sedimentary rocks - include limestone and sandstone.,

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