rivers

Question 1

erosion

Answer 1

wearing away of rock and soil found along the river bed and banks

Question 2

4 types of river erosion

Answer 2

• hydraulic action
• abrasion
• solution
• attrition

Question 3

hydraulic action

Answer 3

pressure of flowing water along against the channel’s bed and banks gradually wears them away

Question 4

abrasion

Answer 4

the force of the water armed with stones and other materials grinds the channel

Question 5

solution

Answer 5

soluble particles are dissolved by river water that is slightly acidic

Question 6

attrition

Answer 6

rocks are carried by the river crash together and break into smaller, smoother and more rounded particles

Question 7

what are levees

Answer 7

• raised bank along the sides of a river
• can be formed naturally by sediment during floods or built by people to stop the river from flooding nearby areas

Question 8

how is a levee formed

Answer 8

1. when the river overflows, it spreads out and slows down
2. as the water slows down, it drops the heavier materials like salt lose to the river bank
3. overtime, these sediments build up, creating a natural raised bak called a levee
4. each time the river floods, more sediment is added making the river higher

Question 9

what is a floodplain

Answer 9

an area of low-lying land next to a river which is prone to flooding. an area of land which is covered in water when the river bursts its banks

Question 10

what are river deltas

Answer 10

river deltas are formed at the end of a river, where it meets the sea or lake. these features form at the mouth of the river