Post on 16-Dec-2015
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SubjectSubjectIII. Sedimentary RocksIII. Sedimentary Rocks
Mr. Mathews’ Earth Science 6Mr. Mathews’ Earth Science 6thth GradeGrade
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• A. From Sediment to Rock
• Sediment – small, solid pieces of material that come from rocks or living things
• It is carried by water, wind, and ice.
1. The 5 Processes that make Sedimentary Rock
Destructive Force
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a. Weathering – process that breaks rock into smaller pieces by wind, water, heat, ice, and gravity.
b. Erosion – wind, water, ice, or gravity moves sediment from one place to another
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1. The 5 Processes that make Sedimentary Rock
c. Deposition – sediment settles out of the water, wind, or ice carrying it.
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1. The 5 Processes that Make Sedimentary Rock
d. Compaction – process that presses sediment together
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1. The 5 Processes that Make Sedimentary Rock
e. Cementation – process in which dissolved minerals solidify and glue particles of sediment together.
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B. Types of Sedimentary Rock
Sed. rocks classified according to type of sediments that make up the rock.
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B. Types of Sedimentary Rock
1. Clastic Rocks - forms when inorganic sediment is squeezed together.
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B. Types of Sedimentary Rock
Examples• Shale• Sandstone• Conglomerate and
Breccia
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B. Types of Sedimentary Rock
2. Organic Rocks – forms where the remains of plants and animals are deposited in thick layers.
-”Organic” refers to substances that once were part of living things.
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B. Types of Sedimentary Rock
3. Chemical Rocks – form when minerals that are dissolved in a liquid crystallize.
Example - Halite