3 Types of Rocks

Igneous, Metamorphic, and Sedimentary

Igneous

  1. Igneous rocks are formed when lava cools and hardens.
  2. Magma is another name for molten lava that comes from deep within the earth.
  3. There are over 700 different types of igneous rocks.
  4. Obsidian is a type of igneous rock.
  5. Pumice is also a type of igneous rock.

Metamorphic

  1. Metamorphic rocks form when they are pressed down within the earth and under a large amount of heat and pressure.
  2. They are found deep down under the earth's surface.
  3. Slate is a type of metamorphic rock.
  4. Erosion helps bring metamorphic rocks up to the surface of the Earth's crust.
  5. Marble is also a type of metamorphic rock.
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Sedimentary

  1. Sedimentary rocks are formed by sediment that is deposited over time.
  2. There are many different layers within a sedimentary rock.
  3. Sedimentary rocks are composed of different things such as: dead plants, decomposed animals, mud, dirt, clay, and minerals.
  4. Fossils are typically found in sedimentary rocks.
  5. Sandstone is one type of sedimentary rock.
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