Why are igneous rocks useful?
All rocks are classified as either igneous, sedimentary, or metamorphic, depending on how they were formed. Sedimentary rocks are created directly from the cooling of magma or lava.
Answer and Explanation:
Igneous rocks are useful because they tend to be very solid, strong, and attractive to the eye. They're also ubiquitous, which is helpful.
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fromChapter 11 / Lesson 4