why are the igneous rocks also called the primary rocks?
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Primary rock is an early term in geology that refers to crystalline rock formed first in geologic time, containing no organic remains, such as granite, gneiss and schist as well as igneous and magmatic formations from all ages
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Igneous rocks begin the rock cycle, and are therefore called primary rocks. Two major divisions include volcanic or extrusive rocks that form when magma is ejected from the Earth's crust, and intrusive rocks, which are created below the surface.
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