erosion, transportation, deposition

Question 1

four processes of erosion

Answer 1

hydraulic action - force of river water colliding with rocks breaks rock particles away from the river channel
abrasion - eroded rocks picked up by the river scrape and rub against the channel, wearing it away.
attrition - eroded rocks picked up by the river crash into each other and break apart. there edges get rounded. causes particle size to decrease from source to mouth
solution - river water dissolves some types of rock like chalk

Question 2

4 processes of transportation

Answer 2

traction - large particles pushed along the river bed by the force of water
saltation - pebble - sized particles are bounced along the river bed by the force of water
solution - soluble materials like limestone dissolve in the water and can be carried along
suspension - small particles like silt are carried along

Question 3

deposition

Answer 3

occurs when river loses its velocity and energy

Question 4

why do rivers slow down

Answer 4

volume of water falls
amount of eroded material increases
shallow water (inside of bend)
river reaches the mouth

Question 5

smaller particles

Answer 5

deposited closer to mouth

Question 6

what acronym to use to remember 4 processes of erosion on a river

Answer 6

haas (F1)