Rocks

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Rocks

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

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