identify the rocks of primary origin
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There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water
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Igneous rocks are the rocks of primary origin.
- Igneous rocks are called primary rocks because they form during the cooling, solidification, and crystallisation of hot and liquid magmas after the earth's formation.
- When a hot, molten rock crystallises and solidifies, it forms igneous rocks (from the Latin word "fire"). Deep within the Earth, near active plate boundaries or hot spots, the melt begins and then rises to the surface.
- Magma (molten rock) cools and crystallises at volcanoes on the surface of the Earth or while the melted rock is still inside the crust, forming igneous rocks.
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