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Flashcards in EQ1; Maintenance of planetary health Deck (14)
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1

Define the geological carbon cycle

Natural cycle that moves carbon between land, oceans and atmosphere, here there tends to be a natural balance between carbon production and absorption within the cycle.

2

What are the 6 important natural stores and fluxes of the natural carbon cycle ?

- terrestrial carbon held within the mantle - released until the atmosphere as CO2 when volcanoes erupt ‘outgassing’
- CO2 within the atmosphere combines with rainfall to produce weak carbon acid (acid rain) dissolves carbon rich rocks , releasing bicarbonates (chemical weathering)
- rivers transport weathered carbon and calcium sediments to the oceans, where they are deposited
- carbon in organic matter from plants and from animal shells and skeletons sinks to the ocean bed when they die (build up strata of coal, chalk and limestone)
- carbon-rich rocks are subducted along plate boundaries
- presence of intense heating along subduction plate boundaries metamorphoses sedimentary rocks by baking ( creating metamorphic rocks) - CO2 is released by metamorphism of rocks rich in carbonates during this process

3

Where is geological carbon from ?

Formation of sedimentary carbonate rocks like limestone and chalk

4

Where is biologically derived carbon ?

Stored in shale , coal and other sedimentary rocks

5

What is the bio-geochemical cycle ?

The carbon cycle where biological and chemical processes determine just how much of the carbon available on the earth’s surface is stored or released at any time

6

where is most carbon stored in the geological C cycle?

most carbon is locked in the terrestrial stores of the long term geological cycle

7

what are 4 spheres of earth involved in the Carbon cycle?

- atmosphere
- biosphere
- lithosphere
- hydrosphere/ oceanosphere

8

give one example of flux of carbon occurring?

2010 eyjafjallajokull volcano in iceland erupted - emmitting between 150,000 to 300,000 tonnes of CO2 into the atmos.

9

what is the difference between the slow and fast carbon cycle ?

slow - takes millions of years ad involves the lithosphere store and the flow into the atmosphere store
- built up C - laying down of sedimentary rocks and ocean sediments
- mostly released by volcanic activity, weathering of sed. rocks and transportation by rivers
Fast carbon cycle - the movement of carbon through food chains and takes place within a lifetime

10

Gt of C in the lithosphere or geosphere ?

- estimated 99.9% of C stored- 60- 100 Man Gt

11

Gt of C in hydrosphere/oceanosphere ?

40,000 Gt

12

Gt of C in soil ?

up to 2,000 Gt

13

Gt of C in Biosphere ?

up to 700 Gt

14

Biological carbon pump?

the process taht transfers carbon via exchanges of CO2 between living organisms (within the biosphere and outside of it)