erosion & deposition. erosion and deposition weathering –the process by which natural forces...
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Erosion & DepositionErosion & Deposition
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Erosion and DepositionErosion and Deposition
• Weathering – the process by which natural forces
break down rock and soil
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Erosion and DepositionErosion and Deposition
• Erosion – the process by which natural forces move
weathered rock and soil from one place to another
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Erosion and DepositionErosion and Deposition
• Erosion – Causes of erosion:
• Gravity• Running water• Wind• Glaciers
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Causes of ErosionCauses of Erosion
• Gravity– Force that moves rock and other materials downhill
– Mass movement—process of moving sediment downhill • May be fast or slow
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Causes of ErosionCauses of Erosion
• Gravity– Force that moves rock and other
materials downhill – Mass movement—process of
moving sediment downhill • May be fast or slow
– Types of mass movement:• Landslides—rock & soil
slide quickly down a steep
slope
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Causes of ErosionCauses of Erosion
• Gravity– Force that moves rock and other
materials downhill – Mass movement—process of
moving sediment downhill • May be fast or slow
– Types of mass movement:• Mudflows—rapid downhill
movement of a mixture of
water, rock, and soil
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Causes of ErosionCauses of Erosion
• Gravity– Force that moves rock and other materials downhill – Mass movement—process of moving sediment downhill
• May be fast or slow
– Types of mass movement:• Slump—one large mass of
rock and soil suddenly slips
down a slope
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Causes of ErosionCauses of Erosion
• Gravity– Force that moves rock and other materials downhill – Mass movement—process of moving sediment downhill
• May be fast or slow
– Types of mass movement:• Creep—very slow downhill
movement of rock and soil
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Causes of ErosionCauses of Erosion
• Running Water
– #1 agent of erosion
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Causes of ErosionCauses of Erosion
• Running Water– #1 agent of erosion
– Types of running water:• Streams
– Small streams = creeks– Large streams = rivers
Colorado River Grand Canyon
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Causes of ErosionCauses of Erosion
• Running Water– #1 agent of erosion
– Types of running
water:• Waves
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Causes of ErosionCauses of Erosion
• Wind– Blows sediment
Dust Bowl
Sand dunes
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Causes of ErosionCauses of Erosion
• Glaciers– Large masses of moving ice
– Movement
changes the land
beneath themAlaska
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Erosion & Deposition
• Deposition– the natural process of laying down
sediments in a new location
– creates new
landforms
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Erosion & Deposition
• Deposition– deposited sediments are laid down in layers
– layers of sediment are
compacted under pressure
and eventually form
sedimentary rock layers
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Erosion & Deposition
• Deposition– deposited sediments are laid down in layers– Layers of sediment are compacted
under pressure and eventually form
sedimentary rock layers.
Sedimentary rocks are like ogres and onions…they have layers.
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Erosion & Deposition
• Deposition– deposited sediments are laid down in layers– Layers of sediment are compacted
under pressure and eventually form
sedimentary rock layers.
Most fossils are found in sedimentary rocks because organisms get covered and
preserved by the layers then mineral replacement occurs over
time.
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Weathering, erosion and depositionWeathering, erosion and deposition are all part of a never-ending cycle that are all part of a never-ending cycle that
constantly shapes and reshapes the constantly shapes and reshapes the land.land.
DestructiveDestructive forcesforces—break down—break downConstructive forcesConstructive forces—build up—build up
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Weathering, erosion and depositionWeathering, erosion and deposition are are all part of a never-ending cycle that all part of a never-ending cycle that
constantly shapes and reshapes the land.constantly shapes and reshapes the land.
ErosionCarries sediment away
DepositionTakes sediment to a new
location to build new rock layers
WeatheringBreaks down rock
Destructive Forces
Destructive Forces
Constructive Forces