Changes to the carbon cycle

Question 1

the flows to the carbon cycle are:

Answer 1

-respiration
-photosynthesis
-decomposition
-combustion
sequestration into ocean and sediments
-weathering

Question 2

the natural changes to the carbon cycle are:

Answer 2

• wildfires
• volcanic eruptions
• natural climate change (every 100,000 years)

Question 3

….% of agricultural emissions are absorbed by plants

Answer 3

25% of agricultural emissions

Question 4

wildfires released …………. tonnes of carbon from 20…..to 20……

Answer 4

released 120 million tonnes from 2001 to 2010

fires in the USA release as much carbon into the atmosphere in a few weeks during fire season as all the emissions in the USA for one year

Question 5

surface ocean pH has decreased (acidified) by ………since ………….. because of…………………

Answer 5

decreased by 0.1 since 1750

this means the hydrogen ion [H+] concentration has increased by 10x (ten fold)

Question 6

………….. rely on coral reefs for livelihood worldwide

Answer 6

500 million

Question 7

in 20….. , oyster larvae in US oyster farms began to die because of acidification
in France, oyster production fell by ………%

Answer 7

2007
millions of dollars in business was lost
in France production fell by 75%

Question 8

in the last ……….. years, Arctic sea ice had retreated by …..%

Answer 8

past 35 years

40% retreat