Why are rivers important?

Question 1

source

Answer 1

the point at which a river starts to flow

Question 2

mouth

Answer 2

the end of the river, where it flows into a lake or the sea

Question 3

evaporation

Answer 3

conversion of a liquid into a vapour or gas

Question 4

condensation

Answer 4

conversion of vapour or gas into a liquid

Question 5

precipitation

Answer 5

water falling from the sky in the form of rain, hail, snow, etc.

Question 6

interception

Answer 6

precipitation being caught by leaves etc.

Question 7

infiltrating

Answer 7

water soaking into soil

Question 8

surface run off / overland flow

Answer 8

water running over the surface of the land

Question 9

throughflow

Answer 9

water that has soaked into soil and is flowing towards the river

Question 10

groundwater flow

Answer 10

water which has soaked into the rock layer and is flowing towards the river

Question 11

watershed

Answer 11

area from which water drains into one river

Question 12

abrasion

Answer 12

materials carried by the river hit rocks and wear them away

Question 13

attrition

Answer 13

materials carried by the river hit each other and wear each other away, becoming smaller rounder

Question 14

hydraulic action

Answer 14

water flows against a rock surface, wearing it away

Question 15

corrosion

Answer 15

rock breaking down due to a chemical reaction

Question 16

suspension

Answer 16

the water carries along fine, light particles of material

Question 17

traction

Answer 17

boulders and large rocks are slowly rolled along the bed of the river

Question 18

solution

Answer 18

the dissolved material is transported

Question 19

saltation

Answer 19

small pebbles and stones are bounced along the river bed

Question 20

deposition

Answer 20

takes place when a river slows down and no longer has the energy to carry the material it is transporting, so drops some of the material

Question 21

erosion

Answer 21

the wearing away of the banks and bed of the river by the power of flowing water in the channel

Question 22

transportation

Answer 22

the river carry material along the river