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Erosion and Dep

Erosion and Deposition

TermDefinition
The lower course contains waterfalls. True or False? False, the upper course contains waterfalls.
What is the lower course? The lowest part of the river. It has a low energy level and the process of deposition takes place. The lower course is now deep and wide and the land area around is flat. The lower course contains the delta/mouth of the river.
How do levees form? Levees form when the flow of the river is slow and the sediment is too heavy for the river to carry further and therefore deposited. They are formed at times of floods where a lot of sediment is deposited.
At times of a flash flood what are the uses of levees? Levees are natural barriers that are located at both sides of the river. Their job is to keep the water level from rising too much as it may cause a lot of destruction for the people and infrastructure in surrounding area.
What course of the river does deposition mostly happen The Lower course
Natural embankments that form along both sides of the river Levees
What kind of erosion happens in the lower course Lateral/horizontal
On the inside of the bend in a meander, the river flow is slower. True or False True
Why do rivers have meanders? Meanders are caused by erosion and deposition in a river.
Where is the current the fastest (in a meander)? The current is the fastest in the outside bend (less friction)
Is there a high amount of sediment, in the upper course? True or False? False
Amount of sediment in the upper course is the greatest among the three courses. True or False? False
The Upper Course is the fastest course in the river, true or false? True
Vertical/lateral/horizontal erosion in the upper course? Vertical
Does deposition of sediment often occur in upper course? Yes
deltas. Lower-course river features
rapids, waterfalls and gorges. Upper-course river feature
lots of horizontal erosion Middle-course river feature
Lots of vertical erosion Upper-course river feature
oxbow lakes Middle-course river features
wide flat-bottomed valleys Lower-course river features
wider, shallower valleys Middle-course river features
interlocking spurs Upper-course river feature
floodplains Lower-course river features
steep-sided V-shaped valleys Upper course feature
meanders, Middle-course river features
heavy mineral deposits Lower-course river features
What are the 5 agents of erosion? gravity, running water, abrasion, glaciers and wind
What are the two types of sediments? transported and residual
What is velocity? distance water travels in a unit of time
What is deposition? the process by which transported materials are left in new locations
What are factors the affect deposition? particle shape, particle size, and particle density
What are the two types of glaciers? valley/alpine glacier continental glacier
What is glacial erosion? when a glacier moves down slope and drags sharp sediments with it against the bedrock
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