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Sedimentary Rocks

Sedimentary Rocks. Rocks. From Sediment to Rock. Small, solid pieces of material that come from rocks or living things. Sedimentary rocks form when sediment is deposited by water and wind. From Sediment to Rock pt. 2.

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Sedimentary Rocks

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  1. Sedimentary Rocks Rocks

  2. From Sediment to Rock • Small, solid pieces of material that come from rocks or living things. • Sedimentary rocks form when sediment is deposited by water and wind.

  3. From Sediment to Rock pt. 2 • Most sedimentary rocks are formed through a series of processes: erosion, deposition, compaction, and cementation.

  4. Erosion • Destructive forces break up and wear away all the rocks on Earth’s surface. These forces of erosion form sediment. • In erosion, running water, wind, or ice lossen and carry away fragments of rock.

  5. Deposition • Moving water, wind, or ice slows and deposits the sediment in layers. • Deposition is the process by which sediment settles out of the water or wind carrying it.

  6. Compaction • The process that presses sediment together is compaction. • Layers are deposited over time and begin to press on each other and the layers beneath them.

  7. Cementation • Minerals in rock slowly dissolve in water. • The minerals act as glue and crystalize to cement the particles together, we call this process cementation.

  8. Types of Sedimentary Rock • There are three major groups of sedimentary rocks: clastic rocks, organic rocks, and chemical rocks.

  9. Clastic Rocks • Most sedimentary rocks are made up of broken pieces of other rocks. • A clastic rock is a sedimentary rock that forms when rock fragments are squeezed together.

  10. Organic Rocks • Organic rock forms where the remains of plants and animals are deposited in thick layers. • The term organic refers to substances that once were part of living things or were made of living things.

  11. Chemical Rocks • When minerals that dissolved in a solution crystallize, chemical rock forms. • Chemical rocks can also form from minerals deposits left when seas or lakes evaporate.

  12. Uses of Sedimentary Rocks • People use sedimentary rock for building materials and tools. • Many building blocks are made from sedimentary rocks like sandstone.

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