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OCR A Level Geography > The Amazon Rainforest > Flashcards

Flashcards in The Amazon Rainforest Deck (101)
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1

How large is the rainforest?

6 million km2

2

How much of the rainforest is in Brazil?

70%

3

What other countries does the rainforest extend into?

Peru, Ecuador, Venezuela, Columbia, Bolivia, Guyana

4

What are the average annual temperatures like?

High - 25 to 30 degrees

5

What are the seasonal differences in temperature?

Small

6

What is the result of cloud cover?

Temperatures kept to 33 degrees max

7

What is the average rainfall?

over 2000mm

8

How much precipitation is recycled by evapotranspiration?

50-60%

9

Where is water lost?

River flow and export of atmospheric vapour to other regions

10

Where does the inward flux of moisture come from?

Atlantic Ocean

11

How is precipitation distributed throughout the year?

Evenly

12

What type of rain is it?

High intensity convectional rainfall

13

How much rain is intercepted by trees?

10% - a lot

14

Intercepted rain accounts for what % of evaporation?

20 - 25%

15

Why is evapotranspiration high?

High temperatures, abundant moisture, dense vegetation

16

What feedback loop is strong?

evapotranspiration-precipitation

17

Where doe most evaporation come from?

Intercepted moisture from leaf surfaces

18

How do plants replace lost moisture from transpiration?

Soil via the roots

19

Why is run-off rapid?

high and intense rainfall and well-drained soil

20

What causes a short peak in river discharge?

seasonal distribution of rainfall

21

What forms of humidity are high?

absolute and relative (the ratio of mass of vapour in air against how much is needed to saturate it)

22

Why is there significant water storage in soil?

High rainfall and deep soil

23

What role do trees play in the water cycle?

absorb and store water then release it via transpiration

24

What geology is dominant?

impermeable crystalline rocks

25

What is the result of impermeable rocks?

minimal water storage capacity so rapid run off

26

Examples of porous rocks:

limestone and sandstone

27

Describe the relief

mostly lowland with gentle relief but steep Andes range in the west

28

What is the effect of lowland on the water cycle?

overland flow and throughflow

29

What is the effect of the Andes on the water cycle?

rapid run off

30

Example of a floodplain

Pantanal