What is a rock identification key?

Answer

A rock identification key is used to identify different types of rocks. Rocks are what makes up the Earth's crust. There are mountains that are found on the bottom of the ocean. Mountains are also located all over the Earth. Rocks are often made of minerals such as quartz, calcite, micas, and feldspars. Some types of rocks are igneous, sedimentary, and metamorphic rock. The rock key talks about the grains the rocks are made from and the colors of the rocks in question.
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