Why do volcanic igneous rocks usually have smaller crystals than plutonic igneous rocks?
- Why do volcanic igneous rocks usually have smaller crystals than plutonic igneous rocks?
Homework Answers
Answer)
plutonic rocks are formed when magma cools and melt below the earth's surface while volcanic rocks are formed when lava cools and melt on the earth's surface.
Volcanic igneous rocks usually have smaller crystals than plutonic igneous rocks because plutonic rocks usually cools very slowly and had enough time to grow a large size compare than volcanic igneous rocks. Volcanic Igneous rocks minerals forms within the Earth's crust and cools more rapidly due to their smaller mineral crystals and they had not enough time to form large size crystals.
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