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Wrogue Wrogue
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11 years ago
Describe how you could identify igneous extrusive rocks from igneous intrusive rocks.
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#1
11 years ago
Intrusive Rocks :
Intrusive rocks are characterized by large crystal sizes, i.e., their visual appearance shows individual crystals interlocked together to form the rock mass. The cooling of magma deep in the Earth is typically much slower than the cooling process at the surface, so larger crystals can grow. Rocks with visible crystals of roughly the same size are said to have a phaneritic texture.

Extrusive Rocks:
They are characterized by fine-grained textures because their rapid cooling at or near the surface did not provide enough time for large crystals to grow. Rocks with this fine-grained texture are called aphanitic rocks. The most common extrusive rock is basalt.
Wrogue Author
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#2
11 years ago
Thank you for your kind assistance.
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