speech on igneous rocks
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Igneous rocks (from the Greek word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface. Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies.
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Igneous rocks are rocks formed from molten magma. The material is made liquid by the heat inside the Earth's mantle. When magma comes out onto the surface of the Earth, it is called lava. Lava cools down to form rocks such as tuff and basalt.
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