geography rivers

Question 1

Drainage basin

Answer 1

an area of land drained by a river and it’s tributaries

Question 2

Abrasion

Answer 2

The load carried my the river scrape and bang against the side of the river so wear away the channel gradually

Question 3

Attrition

Answer 3

Rocks and pebbles hit against each other wearing each other down and becoming smaller

Question 4

Hydraulic action

Answer 4

Water under high pressure causes cracks to force apart and widen in any rocks on the bank of the river. Over time rocks collapse widening the channel

Question 5

Solution

Answer 5

Chemicals dissolved into river

Question 6

Suspension

Answer 6

Particles and small rocks are light enough to float in the water

Question 7

Saltation

Answer 7

Pebbles and small rocks too heavy to be suspended bounce along river bed

Question 8

Traction

Answer 8

Rocks which roll along the river bed

Question 9

Deposition

Answer 9

When the river drops its load due to a decrease in speed and energy