Types Of Rocks!

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

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Types Of Rocks!

  1. 1. Types of Rocks! What do they have to say to us?
  2. 2. The 3 Types of Rocks: <ul><li>Igneous </li></ul><ul><ul><li>Slow-Cooling </li></ul></ul><ul><ul><li>Fast-Cooling </li></ul></ul><ul><ul><li>Flow Direction </li></ul></ul><ul><li>Sedimentary </li></ul><ul><ul><li>Chemical </li></ul></ul><ul><ul><li>Detrital </li></ul></ul><ul><li>Metamorphic </li></ul><ul><ul><li>Foliated </li></ul></ul><ul><ul><li>Non-Foliated </li></ul></ul><ul><li>About the Author </li></ul><ul><li>Resource Page </li></ul><ul><li>Watch a video about the types of rocks! </li></ul>Quit Click on the photo to visit a website about the rock types!
  3. 3. Igneous Rocks <ul><li>Igneous rocks are found by volcanoes and in mountain belts </li></ul><ul><li>They form when melted rock cools and becomes a solid. </li></ul><ul><li>There are 3 prominent ways that igneous rocks form: </li></ul><ul><ul><ul><li>Some cool slowly and have bigger crystals </li></ul></ul></ul><ul><ul><ul><li>Some cool very fast and have small crystals </li></ul></ul></ul><ul><ul><ul><li>Some even show the direction of the lava flow. </li></ul></ul></ul>Quit
  4. 4. Slow-Cooling Igneous Rocks <ul><li>When magma stays underground, it cools very slowly. </li></ul><ul><ul><li>This allows time for the crystals to form which is why there are larger crystals in slow-cooling rocks </li></ul></ul>Quit
  5. 5. Fast-Cooling Igneous Rocks <ul><li>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. </li></ul><ul><ul><li>The crystals have little time to form, therefore, fast-cooling rocks have smaller crystals than slow-cooling rocks. </li></ul></ul>Quit
  6. 6. Igneous Rocks That Show Flow <ul><li>When magma flows out of a volcano, it is called lava. </li></ul><ul><li>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 </li></ul>Quit
  7. 7. Sedimentary Rocks <ul><li>Sedimentary Rocks are formed when rocks ‘settle out’ of water or air. </li></ul><ul><li>There are 2 Types of Sedimentary Rocks </li></ul><ul><ul><ul><li>Chemical </li></ul></ul></ul><ul><ul><ul><li>Detrital </li></ul></ul></ul><ul><li>The rock pieces are then cemented together for form Sedimentary Rocks </li></ul><ul><li>They also contain many fossils from millions of years ago! </li></ul>Quit
  8. 8. Chemical Sedimentary Rocks <ul><li>Chemical Sedimentary rocks form when chemicals, such as calcium carbonate, are precipitated out of the water by organic or inorganic processes. </li></ul>Quit
  9. 9. Detrital Sedimentary Rocks <ul><li>Detrital sedimentary rocks form when solid particles are transported and then accumulate. </li></ul><ul><li>They occur as a result of chemical or mechanical weathering. </li></ul>Quit
  10. 10. Metamorphic Rocks <ul><li>Metamorphic Rocks are found in areas that have been under lots of pressure and/or temperature. </li></ul><ul><ul><ul><li>ex: mountains </li></ul></ul></ul><ul><li>There are 2 types of Metamorphic Rocks: </li></ul><ul><ul><ul><li>Foliated </li></ul></ul></ul><ul><ul><ul><li>Non-foliated </li></ul></ul></ul><ul><li>They can form from either igneous rocks or sedimentary rocks </li></ul><ul><ul><ul><li>Sandstone changes to quartzite </li></ul></ul></ul><ul><ul><ul><li>Granite changes to gneiss (which is shown at the right) </li></ul></ul></ul>Quit
  11. 11. Foliated Metamorphic Rocks <ul><li>As a result of compression and stress on the rock, the minerals within the rock align themselves perpendicular to the direction of stress. </li></ul><ul><ul><li>This alignment creates the banding/foliation in the rock. </li></ul></ul>Quit
  12. 12. Non-Foliated Metamorphic Rocks <ul><li>In general, many non-foliated rocks have not undergone a great amount of stress, and therefore, do not show foliation. </li></ul><ul><li>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. </li></ul>Quit
  13. 13. A Little Bit About Me… <ul><li>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! </li></ul><ul><li>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 ! </li></ul><ul><li>Email me! </li></ul>Quit
  14. 14. Resources <ul><li>Rock Cycle Image </li></ul><ul><ul><ul><li>http://www.rocksandminerals4u.com/ </li></ul></ul></ul><ul><li>All Rock Images </li></ul><ul><ul><ul><li>http://geology.com/rocks/ </li></ul></ul></ul>Quit

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