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Section 3: Sedimentary Rocks
Chapter 5: Rocks Section 3: Sedimentary Rocks
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From Sediment to Rock Sediment – small, solid pieces of material that come from rocks or living things (shells, bones, leaves, stems, etc) Sedimentary rocks form when sediment is deposited by water and wind Form through a series of processes Erosion Deposition Compaction Cementation
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Erosion The destructive process in which water or wind loosens and carries away fragments of rock Rain Waves Ice
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Deposition Process by which sediment settles out of the water or wind carrying it Ex. If in water, sinks to bottom
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Compaction Process that presses sediments together Caused by weight
Layers often remain visible
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Cementation Process in which dissolved minerals crystallize and glue particles of sediment together Dissolved minerals seep into the spaces between particles and harden
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Checkpoint 1 Describe the process by which sedimentary rocks form.
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Checkpoint 1 Describe the process by which sedimentary rocks form.
Sedimentary rocks form through the process of erosion (wind or water loosen and carry away fragments of rock), deposition (sediments settle), compaction (sediments compress), and cementation (sediments glue together).
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Types of Sedimentary Rock
Clastic Rock – a sedimentary rock that forms when rock fragments are squeezed together Fragments can range in size from clay particles to large boulders Shale – forms from tiny particles of clay Sandstone – forms from sand (consist of quartz) Conglomerate – mixture of rock fragments of different sizes with rounded edges Breccia – large fragments with sharp edges
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Types of Sedimentary Rocks
Organic Rocks – form when the remains of plants and animals are deposited in thick layers Coal – forms from the remains of swamp plants buried in water; as layer upon layer of plant remains build up, the weight of the layers squeezes the decaying plants and over time turns into coal Limestone – forms in the ocean from shells and skeletons made of calcite deposit
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Types of Sedimentary Rocks
Chemical Rocks – form when minerals that are dissolved in a solution crystallize Halite – when seas or lakes evaporate Some kinds of limestone – calcite crystallizes as water evaporates
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Checkpoint 2 How are clastic rocks different from organic rocks?
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Checkpoint 2 How are clastic rocks different from organic rocks?
Clastic rocks are formed from broken pieces of other rocks and organic rocks are formed from the remains of living things.
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Uses of Sedimentary Rocks
Hard, but can be shaped Building materials White House built from sandstone Limestone used in making cement and steel Tools Arrowheads from flint
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Checkpoint 3 What properties of sedimentary rocks make them useful as tools and building materials.
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Checkpoint 3 What properties of sedimentary rocks make them useful as tools and building materials. They are hard and durable, but still soft enough to shape.
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Post-less Quiz 1. What is the process in which dissolved minerals crystallize and glue particles of sediment together? a. erosion b. deposition c. compaction d. cementation
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Post-less Quiz 2. What is a sedimentary rock that forms when rock fragments are squeezed together? a. clastic b. organic c. chemical d. igneous
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Post-less Quiz 3. What is the destructive process in which water or wind loosens and carries away fragments of rock? a. erosion b. deposition c. compaction d. cementation
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Post-less Quiz 4. What type of sedimentary rock forms when the remains of plants and animals are deposited in thick layers? a. clastic b. organic c. chemical d. igneous
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Post-less Quiz 5. What is the process by which sediment settles out of the water or wind carrying it? a. erosion b. deposition c. compaction d. cementation
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