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Types Of Rocks!
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Types Of Rocks!

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This presentation explains the 3 main rock types and their features.

This presentation explains the 3 main rock types and their features.

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  • 1. Types of Rocks! What do they have to say to us?
  • 2. The 3 Types of Rocks:
    • Igneous
      • Slow-Cooling
      • Fast-Cooling
      • Flow Direction
    • Sedimentary
      • Chemical
      • Detrital
    • Metamorphic
      • Foliated
      • Non-Foliated
    • About the Author
    • Resource Page
    • Watch a video about the types of rocks!
    Quit Click on the photo to visit a website about the rock types!
  • 3. Igneous Rocks
    • Igneous rocks are found by volcanoes and in mountain belts
    • They form when melted rock cools and becomes a solid.
    • There are 3 prominent ways that igneous rocks form:
        • Some cool slowly and have bigger crystals
        • Some cool very fast and have small crystals
        • Some even show the direction of the lava flow.
  • 4. Slow-Cooling Igneous Rocks
    • When magma stays underground, it cools very slowly.
      • This allows time for the crystals to form which is why there are larger crystals in slow-cooling rocks
  • 5. Fast-Cooling Igneous Rocks
    • On the other hand, magma can also cool very quickly if the temperature is suddenly lowered. This temperature change can occur when the magma is quenched either by air or water.
      • The crystals have little time to form, therefore, fast-cooling rocks have smaller crystals than slow-cooling rocks.
  • 6. Igneous Rocks That Show Flow
    • When magma flows out of a volcano, it is called lava.
    • While the lava is flowing, some of the lava begins to solidify while the lava underneath is still molten. This molten lava pushed through the solid rock and creates a unique rolling texture
  • 7. Sedimentary Rocks
    • Sedimentary Rocks are formed when rocks ‘settle out’ of water or air.
    • There are 2 Types of Sedimentary Rocks
        • Chemical
        • Detrital
    • The rock pieces are then cemented together for form Sedimentary Rocks
    • They also contain many fossils from millions of years ago!
  • 8. Chemical Sedimentary Rocks
    • Chemical Sedimentary rocks form when chemicals, such as calcium carbonate, are precipitated out of the water by organic or inorganic processes.
  • 9. Detrital Sedimentary Rocks
    • Detrital sedimentary rocks form when solid particles are transported and then accumulate.
    • They occur as a result of chemical or mechanical weathering.
  • 10. Metamorphic Rocks
    • Metamorphic Rocks are found in areas that have been under lots of pressure and/or temperature.
        • ex: mountains
    • There are 2 types of Metamorphic Rocks:
        • Foliated
        • Non-foliated
    • They can form from either igneous rocks or sedimentary rocks
        • Sandstone changes to quartzite
        • Granite changes to gneiss (which is shown at the right)
  • 11. Foliated Metamorphic Rocks
    • As a result of compression and stress on the rock, the minerals within the rock align themselves perpendicular to the direction of stress.
      • This alignment creates the banding/foliation in the rock.
  • 12. Non-Foliated Metamorphic Rocks
    • In general, many non-foliated rocks have not undergone a great amount of stress, and therefore, do not show foliation.
    • Also, the minerals that compose non-foliated rocks are equidimensional crystals. As a result, no foliation would appear because all the mineral grains look similar.
  • 13. A Little Bit About Me…
    • My name is Laura Donker, and I am an Earth Science major and a Biology minor. I enjoy spending time outdoors…especially in mountainous places, and yes – I do like looking at rocks!
    • One day, I plan to be a science teacher at a middle or high school. I cannot wait to share everything I know with my students !
    • Email me!
  • 14. Resources
    • Rock Cycle Image
        • http://www.rocksandminerals4u.com/
    • All Rock Images
        • http://geology.com/rocks/