Question

why are igneous rocks crystalline? Explain the difference between extrusive and intrusive rocks. ​

Answer 1

Answer:

Igneous rocks are rocks formed from the crystallization of a liquid (molten rock). ... The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals.

Explanation:

Extrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. In contrast, intrusive rock refers to rocks formed by magma which cools below the surface.

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