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What is an extrusive igneous rock and what are some examples?
What properties distinguish these different types of extrusive igneous rocks?
Basalt is typically dark in color and has a fine-grained texture. Andesite is usually grey in color with a medium-grained texture. Rhyolite is light in color and has a fine-grained texture. These differences in color and texture are due to differences in the mineral composition and cooling rate of each type of rock.