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Day Lecture 2 Notes Date Sedimentary Rocks

Day Lecture 2 Notes Date Sedimentary Rocks - rocks that are the result of the processes of weathering and erosion. - account for 75% of the rocks exposed at Earth's surface.

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Day Lecture 2 Notes Date Sedimentary Rocks

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  1. Day Lecture 2 Notes Date Sedimentary Rocks - rocks that are the result of the processes of weathering and erosion. - account for 75% of the rocks exposed at Earth's surface

  2. Sedimentary rock comes from fragments of other rocks that have been weathered, eroded,deposited, compacted, and cemented

  3. - can be formed from metamorphic, igneous or other sedimentary rocks

  4. - account for 75% of the rocks exposed at Earth's surface

  5. Three types of sedimentary rocks 1. Clastic Sedimentary Rock - sedimentary rocks that have been formed from the fragments - clastic comes from the Greek word klastos which means "broken”.

  6. - Conglomerate rocks are made of large rock pieces that have been cemented together. * When looking at this rock type, you can easily see the parts that it has been made of.

  7. - Sandstone rocks are made of fine sand grains * sand has been cemented together. Rubbing the surface of sandstone rocks may result in small grains of sand being rubbed off of the rock.

  8. -Shale is made up of very fine grains of clay *The texture of shale is very smooth to the touch and can be broken with your hands

  9. 2. Nonclastic Sedimentary Rock - is sedimentary rocks resulting from chemical deposits. - can be rock that formed when water evaporated and left behind minerals.

  10. - Halite or Rock Salt is a rock that forms as water evaporates leaving the crystals to form a solid *Stalagmites and Stalactites form as mineral rich water runs off or runs onto them

  11. 3. Organic Sedimentary Rocks - formed from the life processes of living organisms or the remains of the organisms. - Limestone that is formed from the shells of clams and other organisms is organic

  12. - Coal is made from plants that died in swamps millions of years ago. * Coal therefore is another example of organic rocks.

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