Topic 1a5-The carbon cycle

6 things that contain carbon

All life forms, sedimentary rocks, diamonds, graphite, coal, petroleum(oil and natural gas)

What is respiration and what balances it

Breathing and eating - photosynthesis

What is it called when human activity releases carbon

Anthropogenic carbon

What graph shows rising CO2 in the atmosphere

The keeling curve

What caused rapid CO2 increases in the atmosphere post 1750

 The industrial revolution 

Where is carbon stored

In the atmosphere

Dissolved in the oceans

Held as biomass

Bound in carbonate rocks

Held in sedimentary rocks

How much CO2 emissions are humans responsible for

2000 gigatonnes

What are the major sources of CO2 emissions

Coal-24%

Oil-25%

Gas-10%

Land use-29%

Biomass dominated until 1900

3 major sinks for human carbon emissions

Atmosphere, ocean and land

Atmosphere-44%

Ocean-30%

Land-26%

This results in negative feedback

Ocean and plant sinks ave absorbed 56% of human carbon emissions since 1750

How old is Earth and what are the different periods of time divided into

4.5 billion years

Eons,eras,periods,epochs