What is rock ? give any one example of Rock around you.
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Plutonic or intrusive rocks result when magma cools and crystallizes slowly within the Earth's crust. A common example of this type is granite. Volcanic or extrusive rocks result from magma reaching the surface either as lava or fragmental ejecta, forming minerals such as pumice or basalt
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A rock is a solid mass of geological materials.
example: marble
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