Flashcards
Geography - AQA - GCSE - Physical - Rivers
Flashcards do conjunto (19)
- 1Weathering: Chemical WeatheringWeathering caused by chemical reactions (mainly with water and substances dissolved in it). When rocks are broken down or chemically altered.
- 2Weathering: Physical WeatheringCaused by the effects of the changing temperature on rocks, sometimes assisted by water
Freeze Thaw
Exfoliation - 3Physical Weathering: Freeze ThawWater seeps into cracks in rocks, freezes and expands, eventually breaking rock apart.
- 4Physical Weathering: Exfoliation/Onion SkinRock heats up and expands by day, and cools down and contracts by night, causing stress on the outer layers. This stress then causes them to peel off.
- 5Biological WeatheringAny weathering involving living things.
Tree roots going into cracks in rocks, as the tree grows, rock splits.
Animals bore into rocks for protection.
Bacteria, algae or lichen produce chemicals that break down rock. - 6Erosion in riversDifferent types include:
Hydraulic action
Abrasion / Corrasion
Corrosion
Attrition - 7Erosion in rivers: Hydraulic ActionThe force of the water pushing against the banks is enough to gradually wear it away.
- 8Erosion in rivers: Abrasion/CorrasionRocks carried by the river rub against the bed and the banks and wear it away.
- 9Erosion in rivers: CorrosionRocks that have been broken up already are broken up into tiny pieces and dissolved into the water.
- 10Erosion in rivers: AttritionRocks being carried by the river collide with each other, smashing into smaller, smoother and rounder pieces.
- 11Transportation in riversDifferent types include:
Saltation
Traction
Solution
Suspension - 12Transportation in rivers: SaltationSmall stones are bounced along the river bed.
- 13Transportation in rivers: SuspensionVery small, fine stones are carried down the river, suspended.
- 14Transportation in rivers: SolutionMinerals are dissolved into the water and carried along as a solution.
- 15Transportation in rivers: TractionLarger rocks are rolled downstream along the bed.
- 16DepositionWhen a river loses energy, it will drop some of the material it is carrying.
When the volume of water decreases, or when it enters a shallow area, deposition is common. - 17Mass MovementDifferent types include:
Slumping
Soil Creep - 18Mass Movement: SlumpingRapid movement of large amounts of ground, which occur after periods of heavy rain.
- 19Mass Movement: Soil CreepSlow movement of soil, occurring on gentle slopes. It causes ripples in the earth.
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- Descrição
- All the flashcards needed to prepare for an early physical geography rivers test.
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- Josh Anderson
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