write how the primary rocks were formed on the Earth's crust?
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- Igneous Rocks. Igneous rocks are formed by the cooling of highly heated molten fluid material called as Magma. ... As they comprise the earth's first crust and all other rocks are derived from them, they are also called as the parents of all rocks or the Primary Rocks.
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The igneous rocks are formed when magma cools and solidifies. Igneous rocks form out of magma and lava from the interior of the earth, therefore, they are known as primary rocks. ... The process of cooling and solidification can happen in the earth's crust or on the surface of the earth.
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