What erosional feature is created at the bottom of a waterfall?
Plunge Pool
15
What is a confluence?
The exact point a tributary meets a larger river.
20
What is hydraulic action?
The sheer force of the water eroding the side of the river bed and banks
20
What is attrition?
Rocks in the river bashing into each other, becoming more rounded.
20
What is corrasion?
Rocks in the river being thrown against the river bed and banks, knocking more pieces off.
20
What is traction?
Rocks in the river being rolled along the river bed.
20
What is saltation?
Rocks being bounced along the river bed.
20
What happens on the outside bed of a meander? 3 things.
The water is moving faster, so erosion occurs, creating a river cliff.
25
What happens on the inside bend of the meander? 3 things.
The water is moving slowly, so deposition occurs, creating a river beach.
25
What features of a river can you see on this map? Name 4.
Waterfall, confluecne, ox-bow lake, tributary, v-shaped valley, meander, floodplain
25
Explain the formation of a levee.
Everytime a river floods, sediment is dropped, the larger material first and the smaller is dropped furthest away. Over time the larger material builds up.
25
Explain the formation of an ox-bow lake.
Usually during a flood, the neck of the meander breaks through due to continued erosion and leaves the meander cut off.