Fichas
River Processes
Fichas del conjunto (20)
- 1WeatheringThe breaking-down of rock in situ (where it is).
- 2Weathering - Chemical WeatheringWeathering caused by chemical reactions (mainly with water and substances dissolved in it). When rocks are broken down or chemically altered.
- 3Weathering - Physical WeatheringCaused by the effects of changing temperature on rocks, sometimes linked with Freeze-Thaw weathering.
- 4Physical Weathering: Freeze-ThawWater seeps into cracks in rocks, the water then freezes, expands and thus causes the rock to break.
- 5Physical Weathering: Exfoliation / Onion Skin WeatheringRock heats up and expands by day, and cools down and contracts by night, causing stress on the outer layers. This stress results in the layers peeling off and revealing the layers that lie underneath.
- 6Biological WeatheringAny weathering which involves living things.
Tree roots grow inside cracks in rocks, and as the tree grows, the cracks expand and the rocks split and break.
Animals bore into rocks for protection.
Bacteria, algae, fungi or lichen produce chemicals that breaks down rock. - 7ErosionThe wearing away of the land by the action of rivers, ice, the wind and the sea.
- 8River Erosion: Hydraulic ActionThe force of the water pushing against the banks is enough to gradually wear it away.
- 9River Erosion: Abrasion / CorrasionRocks carried by the river rub against the bed and the banks and wear it away.
- 10River Erosion: CorrosionRocks that have already been broken up are broken up into tinier pieces and dissolved into the water.
- 11River Erosion: AttritionRocks being carried by the river collide into each other, smashing into smaller, smoother and rounder pieces.
- 12TransportationInvolves the transportation of matter in rivers.
- 13River Transportation: SaltationSmall stones are bounced along the river bed.
- 14River Transportation: SuspensionVery small, fine stones are carried down the river, suspended by the river's stream.
- 15River Transportation: SolutionMinerals are dissolved into the water and carried along as a solution.
- 16River Transportation: TractionLarger rocks are rolled slowly along the river bed.
- 17DepositionWhen a river loses energy, it will deposit some of the material it is carrying.
When the volume of the water decreases, or when it enters a shallow area, deposition is common. - 18Mass MovementThe movement of material down a slope due to gravity.
- 19Mass Movement: SlumpingRapid movements of large amounts of material, which occur after heavy bouts of rain, the rain causes the land to become saturated, and it can no longer support its own weight.
- 20Mass Movement: Soil CreepSlow movement of soil, occurring on gentle slopes. It causes noticeable ripples in the earth. This process is sped up by heavy rain.