Types of Rocks Pt. 2: The Layered Ones

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In part 1 of this article we discussed fiery liquid rocks, like lava. However, most of the earth’s crust is covered by a layer of sand and mineral fragments, or sediments. In many places, heat and pressure have compacted these sediments into solid rock. This is called sedimentary rock. Over 75 percent of the earth’s surface is covered […]