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  • 1. What are Rocks?
    By: Ticisa Jeffers
  • 2. What are Rocks?
    Naturally occurring solid made up of 2 or more minerals.
  • 3. Minerals
    Minerals are made of chemicals - either a single chemical or a combination of chemicals.
    Over 3000 known minerals
    Examples: Quartz, Emerald, Copper
  • 4. Type of Rocks
    Igneous
    Sedimentary
    Metamorphic
  • 5. Igneous Rocks
    Made from fire or heat
    Forms when volcanoes erupt and the liquid rock comes up to the earth's surface
    When the rock is liquid & inside the earth, it is called magma
    It cools very slowly and is very hard
    When the magma gets hard inside the crust, it turns into granite
    Most mountains are made of granite
  • 6. Stone Mountain
  • 7. Sedimentary Rocks
    Rock gets worn away due to erosion
    Rain, freeze/thaw cycle, wind and running water cause mountains to crumble, forming sediments
    Eventually most of the broken bits of the rock end up in the streams & rivers that flow down from the mountains
    sediments settle to the bottom of the lake or oceans they run into
  • 8. Sedimentary Rocks
    Sedimentary rocks often have fossils in them.
    Examples: sandstone and shale
  • 9. Metamorphic Rocks
    Originally igneous or sedimentary, but due to movement of the earth's crust changed
    Transformed by great heat or pressure
    Least common of the 3 kinds of rocks
    Example: Marble
  • 10. The Rock Cycle
    Process that explains how rocks are constantly being formed, worn down and then formed again
    It takes thousands and millions of years for rocks to change.
    Weathering- the process of chemical or physical breakdown of the minerals in the rocks
  • 11. The End