Rocks

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this presentation tells the types of rocks and their descriptions

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Rocks

  1. 1. ROCKS
  2. 2. TYPES OF ROCKS IGNEOUS ROCKSIGNEOUS ROCKSSEDIMENTARY ROCKSSEDIMENTARY ROCKSMETAMORPHIC ROCKSMETAMORPHIC ROCKS
  3. 3. IGNEOUS ROCKS Igneous means “made from fire or heat”. Igneous rock is formed when magma from deep inside the Earth forces its way out and reaches the Earth‟s surface. Magma- molten or liquefied rock
  4. 4. TWO KINDS OF IGNEOUS ROCKS EXTRUSIVE IGNEOUS  This forms when magma comes to the surface and cools quickly.  The slower the rocks cool down, the larger the crystals that are formed.
  5. 5. TWO KINDS OF IGNEOUS ROCKS INTRUSIVE IGNEOUS  Itis formed when magma hardens or cools slowly inside Earth.  Slowly cooling magma forms coarse-grained rocks.
  6. 6. EXAMPLES OF IGNEOUS ROCKS Granite Basalt Pumice Obsidian Peridotite Gabbro TYPES OF ROCKS
  7. 7. SEDIMENTARY ROCKS Made from pieces of rocks and minerals called sediments which form in layers The particles were buried, compressed and cemented to a solid mass. Lithification- the process that turns the loose sediments in the bottom of the sea or river bed into hard sedimentary rocks
  8. 8. EXAMPLES OF SEDIMENTARY ROCKS Shale Limestone Sandstone Coal Breccia Flint TYPES OF ROCKS
  9. 9. METAMORPHIC ROCKS Metamorphic means „change in form‟ Either sedimentary or igneous rocks that become different in color, hardness and in other ways because of their exposure to heat and pressure
  10. 10. EXAMPLES OF METAMORPHIC ROCKS Marble Slate Schist Gneiss Quartzite

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