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What are sedimentary rocks?
sedimentary rock forms from materials at the earths surface.
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What is weathering?
process of breaking rock into smaller piece. It occurs becuase of natural forces such as flowing water, moving ice, thawing and unthawing.
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What is erosion?
the movement of sediment to a new location
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What is deposition?
the dropping of sediment from wind or water tht slows down or from ice that melts.
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What is sedimentation?
Layers of sediment build up over miollions of years.
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What is cementation?
the weight of the upper layers of sedimentation pressess down on the lower layers and compacts the sedimentation. cementation then glues the compacted particles together.
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What are the 2 types of sedimentary rock?
- 1. Clastic rock
- 2. Chemical rock
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What is clastic rock?
made of sediments that were weathered, transported, and deposited in layers.
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What is chemical rock?
mineterals that were dissolved in water, came out of solution, and then depsoited.
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Clastic rocks particals cane be fine, medium and corse. Name an example of each
- Fine - Shale
- Medium - Sandstone
- Corse - Conglomerate
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What is a conglomerate rock?
sedimentary rock formed from pebbles ane sand that are cemented together.
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Name 3 Chemical rocks.
Chalk, LAimestone, gypsum
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What is the most common chemical sedimentary rock
Limeston
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How is gypsum rock formed?
ocean water evaporates and cannot be replaced with more ocean water or fresh water
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Name 3 uses for sedimentary rock
- 1. Building - shale and sandstone
- 2. season food - rock sale
- 3. energy resources - petroleum and natural gas are found in sedimentary rocks
- 4. farming - farmers use limeston for treating acidic soils
- 5. learning of earths hx - scientists use fossils to piece together what life was like in the past.
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