Sedimentary Rock 10
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Transcript of Sedimentary Rock 10
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Sedimentary RockStudents will be able toDescribe how rocks are formedClassify the sedimentary typesList uses for this rock type
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Changing Earth’s Surface
1. WeatheringPhysical breaking of rock
2. Mass WastingFalling due to gravity
3. ErosionRemoval by mobile agents (water, wind, ice…)
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Weathering
Frost Wedging
Water expands 9% when frozen
Repeated cycles will break apart rocks
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Weathering
Unloading
When pressure is released by exposure
Rock cracks in sheets when it expands
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Weathering
Biological
Damage caused by roots and animals
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Weathering
Chemical
Acid rain, pollution, …
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Mass Wasting
Spheroidal
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Erosion
Loss of material
usually loose soil
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Sedimentary Rock
5% of Earth’s outer crust
High Value
Contains major energy resources
Contains fossil record
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Formation
Compaction
Weight of material on top presses into rock
Cementation
Minerals enter spaces between to harden
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Types
Clastic
Rock fragments squeezed together
Organic
Formed from remains of living things
Chemical
Formed from chemical during evaporation
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Clastic
Shale
50% of all sedimentary rock
Made from tiny pieces of clay
Black due to abundant carbon (living)
Formed in oxygen poor area (swamp)
“prevents decay”
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Sandstone
20% of all sedimentary rock
Small grains (wind or river)
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Conglomerate
Large particles
Steep slopes or fast streams
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Organic
Limestone
10% of all sedimentary rock
Mostly calcite
Skeletons of coral reefs
Accumulation of shells
Caves from minerals above
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Coal
Many plant parts
Low oxygen formation (swamp)
High heat and pressure to solidify
Major source of US electrical energy
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Chemical
Evaporites
Seawater and salt flats evaporate
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Quiz
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Homework
• Describe how sedimentary rocks are made