✅3.1.1.3 - The Carbon Cycle Flashcards Preview

AQA A Level Geography - PHYSICAL > ✅3.1.1.3 - The Carbon Cycle > Flashcards

Flashcards in ✅3.1.1.3 - The Carbon Cycle Deck (62)
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1

What is a Carbon store?

The lithosphere, hydrosphere, cryosphere, atmosphere etc

2

What is a carbon sink?

A store that takes in more carbon than it releases

3

What is a carbon source?

A store that releases more carbon than it takes in

4

What is a carbon transfer?

Processes that transfer carbon between stores

5

What is a GtC?

A gigatonne of Carbon, 1 gigatonne = 1 billion tonnes

6

What is anthropogenic CO2?

Carbon Dioxide generated by human activity

7

What is a greenhouse gas?

Any gaseous compound in the atmosphere that is capable of absorbing infrared radiation, therefore trapping and holding heat in the atmosphere

8

What is the lithosphere?

The crust and uppermost mantle, the hard rigid outer layer of the earth

9

What is weathering?

The breakdown of rocks in situ by weather, plants and animals

10

What is the biosphere?

The total sum of all living matter

11

What is Carbon Sequestration?

The capture of CO2 from the atmosphere, or capturing anthropogenic CO2 from large scale stationary sources such as power stations - put into long term storage

12

Why is recycling carbon essential for life?

It enables food to be provided for plants and animals and creation of energy sources

13

What can carbon form?

Biological molecules, Gases (eg CO2, CH4), Hydrocarbons

14

What is the primary source of Carbon?

The Earth's interior

15

What are some of the stores in the carbon cycle?

Sedimentary rock, coal, oil, gas, plants, atmosphere, phytoplankton etc

16

What are some of the transfers in the carbon cycle?

Weathering and erosion, rock cycle, photosynthesis, respiration, burning, decomposition, diffusion

17

What is the largest store of carbon?

Marine sediments and sedimentary rock

18

How is the ocean a store of carbon?

CO2 is absorbed directly from the air and river water discharges carbon in solutions

19

How is soil organic matter a store of carbon?

They contain rotting organic matter and are important carbon stores. Carbon can remain in the soils for hundreds of years

20

What are inorganic sources of carbon in the lithosphere?

Fossil fuels, eg coal, oil, natural gas and carbonate-based sedimentary deposits

21

What are organic sources of carbon within the lithosphere?

Litter, organic matter and humic substances in soils

22

What are the three stores of carbon in the lithosphere?

Marine sediments & sedimentary rocks
Soil organic matter
Fossil fuel deposits

23

How is carbon in the biosphere divided up?

Into terrestrial and oceanic

24

What are the main sources of carbon in the biosphere?

Living vegetation
Plant litter
Soil humus
Peat
Animals

25

Where is most of the carbon in the cryosphere?

In the soil areas of permafrost where decomposing plants and animals have frozen into the ground

26

What are methyl clathrates?

Molecules of methane frozen into ice crystals

27

What does most frozen organic matter in permafrost consist of?

Partially decayed roots, whole roots and other plant material

28

When is cryospheric carbon released into the atmosphere?

When the permafrost melts

29

What are oceanic carbon stores divided into?

Surface later (euphotic zone)
Intermediate and deep layer
Living organic matter

30

What is the euphotic zone?

The surface of the ocean where sunlight can penetrate and photosynthesis can take place