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What is it called when magma pushes into cracks in rock formations and causes them to widen?

User Basya
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An intrusion can form features such as d(i)kes and xenoliths. An extrusion could include lava and volcanic rock. Magma can intrude into a low-density area of another geologic formation, such as a sedimentary rock structure. When it cools to solid rock, this intrusion is often called a pluton.

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source: nationalgeographic.org

User Denisjacquemin
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