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What are rocks ppt
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Types Of Rocks

  1. 1. Types of Rocks Sedimentary, Igneous, Metamorphic
  2. 2. Sedimentary Rocks <ul><li>Made up of smaller rocks cemented together </li></ul><ul><li>Sometimes have fossils </li></ul><ul><li>Usually have layers. </li></ul>
  3. 3. Sedimentary Rocks <ul><li>Form when loose sediment (rocks, sand) is deposited by water, compacted, and cemented together. </li></ul><ul><li>Form as a chemical reaction in the water that leaves a chemical deposit, usually on an ocean bottom. </li></ul><ul><li>Form along beaches, by rivers, or under the water in lake or oceans. </li></ul>
  4. 4. Sedimentary Rocks
  5. 5. Examples of Sedimentary Rocks
  6. 6. Igneous Rocks <ul><li>Some were once liquid magma that erupted from volcanoes. They cooled very quickly. (Extrusive) </li></ul><ul><li>Others were once liquid magma, but they did not erupt from volcanoes. Instead, they cooled slowly underground. (Intrusive) </li></ul>
  7. 7. Igneous Rocks <ul><li>Extrusive: </li></ul><ul><ul><li>Rocks that are from cooled lava (above ground. </li></ul></ul><ul><ul><li>They cooled very quickly, therefore formed small crystals </li></ul></ul><ul><li>Intrusive </li></ul><ul><ul><li>Rocks that are from cooled magma (below ground) </li></ul></ul><ul><ul><li>They cooled very slowly, therefore formed large crystals. </li></ul></ul>
  8. 8. Igneous Rocks <ul><li>Which is extrusive and which is intrusive? </li></ul>Extrusive Intrusive
  9. 9. Igneous Rocks
  10. 10. Examples of Igneous Rock
  11. 11. Metamorphic <ul><li>Form when igneous, sedimentary, or other metamorphic rocks are heated and/or squished, forming a new rock type. </li></ul><ul><li>Usually has interlocking crystals and layers (called foliation) </li></ul>
  12. 12. Metamorphic <ul><li>This can either happen underground or above ground. </li></ul><ul><ul><li>Underground: high pressure and heat </li></ul></ul><ul><ul><li>Above ground: volcano erupting </li></ul></ul><ul><li>When classifying metamorphic rocks, they always come from a parent rock. </li></ul>
  13. 13. Metamorphic Rocks
  14. 14. Examples of Metamorphic Rocks
  15. 16. Review <ul><li>What are the three rock types? </li></ul><ul><li>What are sedimentary rocks? </li></ul><ul><li>What are igneous rocks? </li></ul><ul><li>What are the two types of igneous rocks? </li></ul><ul><li>What are metamorphic rocks? </li></ul>
  16. 17. Copyright Information <ul><li>All information was retrieved from research done on the internet in February 2007. </li></ul><ul><li>All pictures were retrieved from a Yahoo image search in February 2007. </li></ul>

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