Rocks and Minerals | Classifying this old rock
Classifying this old rock
Rocks vary enormously because of the way they are formed. Geologists, scientists who study rocks, classify them into three categories: igneous, sedimentary, and metamorphic rocks. IgneousRock formed from the cooling and hardening of magma. (pronounced IG-knee-us) rocks are formed when rock material cools from a hot, liquid state called magma. Magma is a thick substance like melted glass. When it reaches Earth's surface, usually through volcanic eruptions, it is called lavaMolten rock that occurs at the surface of Earth, usually through volcanic eruptions..
Sedimentary rocksRock formed from the compressed and solidified layers of organic or inorganic matter. are formed from particles that have broken away...
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