How many types of Igneous Rocks there are?
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There are over 700 type of igneous rock , and they are generally the hardest and heaviest of all rocks .
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Two types of igneous rocks are extrusive and intrusive igneous rocks. Intrusive igneous rocks are formed when magma cools down and solidifies under the earth's surface. Extrusive rocks are formed when lava cools down and solidifies above the earth's surface.
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