Why can igneous rocks be distinguished from chemical sedimentary rocks based on composition?
A) The composition of each rock results in different texture.
B) The composition of each rock results in different colors.
C) Igneous rocks, since formed underground, are made up of the same elements as chemical sedimentary rocks.
D) Igneous rocks are primarily made up of silicates, which chemical sedimentary rocks don't contain.
Answer: D
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