Earth.com reported
Just as biologists need to distinguish between different kinds of plants and animals, geologists depend on being able to classify different types of rocks. It turns out that the best way to classify rocks is based on the process in which they were formed. There are three main processes that result in the three overarching categories of rocks. These categories, which we will explore in detail, are igneous, sedimentary, and metamorphic rocks.
Read more at A Beginner’s Guide to Types of Rock: Igneous, Sedimentary, and Metamorhpic


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