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WJEC GCSE Geography B - Key Terms & Definitions > Theme 2 > Flashcards

Flashcards in Theme 2 Deck (47)
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1

Afforestation

The planting of trees in an area

2

Air pressure

The force is caused by the atmosphere pressing down on the Earth's surface

3

Alluvium

Find the sentiment, for example: silt, that is rich in nutrients and deposited by a river

4

Anticyclone

A high-pressure weather system. Average sealevel pressure at the centre of the system is usually above 1000 mbar. It brings stable weather

5

Aquifer

And underground lake, that will still water. The water found here can be abstracted from the rock by drilling boreholes

6

Attrition

When the pebbles that are transported by a river or along the coast knocked together and become smaller, more rounded and smoother. Like when you play conkers at primary school

7

Backwash

The movement of material back of a beach

8

Bankfull stage

The discharge above which the river will be on able to hold all of the water so it floods

9

Base flow

The normal level of water within a river

10

Beach nourishment

A coastal management technique, whereby pebbles (sediment) are moved into areas that need nourishing, due to loss of pebbles (sediment) by Longshore drift

11

Channelisation

Strengthening of the river's bands to make the river flow move quicker through the area and reduce the risk of flooding

12

Channel (river)

The area in which a river travels in

13

Climate

The average weather conditions measured over a 30 year period

14

Climatic region

A large area which experience is the same or similar climatic conditions

15

Closed system

A system which does not have any input or output and is closed to its surroundings

16

Condensation

The process by which water turns from a gas to a liquid form

17

Dumbs

Large scale hard engineering management features seen in rivers

18

Deforestation

Theremoval of trees in an area

19

Deposition

The dropping of material in a river or at the coast

20

Depression

A low pressure weather system found in the mid latitudes of the northern hemisphere where tropical warm air mass pushes into an Arctic cold air mass. Warm air rises to give low-pressure; this is usually less than 1000 mbar. Brings on stable weather

21

Discharge

The volume of water flowing down a river at any given time, measured in cubic metres per second-CUMECS

22

Drainage basin/catchment area

An area of land which a river collects all of its water from

23

Drought

I prolonged period of whether, when you receive less than the average rainfall

24

Erosion

The breaking down of material in a river or at the coast

25

Evaporation

The process by which water tones from a liquid into a gas

26

Falling limb

The decrease in discharge line, shown on a flood hydrograph

27

Flood

When a river has more than average amount of precipitation, causing water to flow over an area that is usually dry

28

Flood plain

The stretch of relatively flat land on the sides of the river. It is usually covered by fertile flood deposits called alluvium

29

Flow

The transfer of water between stores this could be in the same state or involve a change in state

30

Front

The Boundry at which hot and cold air meet