Sed meta rocks

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Sed meta rocks

  1. 1. Earth Science
  2. 2. Sedimentary Rocks A sedimentary rock is made up of pieces or fragments of other rocks. Rocks can be broken up through the process of Weathering and or Erosion. Once broken down into fragments or sediments, those fragments need to be buried, compacted and cemented together.
  3. 3. Parts of Sedimentary Rocks Sediments  Fragments of any types of rocks formed by the process of weathering – transported by erosion Weathering is the breaking down of rocks into fragments while Erosion is the removal of those fragments by wind, water, ice and gravity Water can transport sediments down stream (as shown in this animation – click) and they are deposited according to size. The smallest sediments travel the furthest.
  4. 4. ESRT Page 6 – shows how much stream velocity is required to move different size particles
  5. 5.  Process of Weathering  Types of weathering  Chemical  Where the end product has been changed. Can’t get it back to it’s original form.  Mechanical  Changing size, color and or shape of rocks, but NOT changing its composition
  6. 6. Types of sedimentary Rocks Clastic rocks – made up of fragments of other rocks Sandstone – made from particles of sand  Types – sandstone, siltstone, shale, conglomerate Bioclastic – made up of fragments of once living things. Coquina –  Types –Limestone – Bituminousmade from sea shells Coal Chemical – formed from minerals that precipitate or evaporate out of solution.  Types – Rock salt, Gypsum, Dolostone
  7. 7. Key Features of SedimentaryRocks Fossils Ripple marks Geode Mud cracks
  8. 8. Metamorphic Rocks Formed through the process of Heat and or Pressure. Click !!  Minerals may be enlarged, recrystalized or new minerals may appear.There are two areas where heat and or pressure are common occurrences Contact metamorphism  Formed when magma underground heats up the rocks (but doesn’t melt them) in direct contact with the heat source. Regional metamorphism  Wide scale area usually associated with plate collisions
  9. 9. Features of Meta Rx Foliation Mineral Alignment  When minerals align themselves through the process of metamorphism. Parent Rock  Where the original rock came from  For example Gneiss was Granite  Quartzite was sandstone

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