Carbon Cycle

Which carbon store contains 38,000 billion metric tons?

• Marine sediments and sedimentary rocks

• ocean

• soil

• atmosphere

Which carbon store contains 100,000 billion metric tons?

• Marine sediments and sedimentary rocks

• ocean

• soil

• atmosphere

Which carbon store contains 1500 billion metric tons?

• Marine sediments and sedimentary rocks

• ocean

• soil

• atmosphere

Which carbon store contains 750 billion metric tons?

• Marine sediments and sedimentary rocks

• ocean

• soil

• atmosphere

Photosynthesis word equation is...

• carbon dioxide + water + sunshine = oxygen + glucose 

• carbon dioxide + water = oxygen + glucose

• oxygen + glucose + sunshine = carbon dioxide + water

• carbon dioxide + oxygen = water + glucose + sunshine

Which process transfers carbon from living, dead or decomposed biomass to the atmosphere?

• combustion

• photosynthesis

• sequestration

Which process transfers carbon from the atmosphere to the hydrosphere and biosphere?

• weathering

• respiration

• decomposition

• combustion

Decomposition returns CO2 to the atmosphere and also adds carbon to soil stores.

• True!

• False!

Rocks are weathered by carbonation. This occurs when...

• CO2 in the air mixes with rainwater to create carbonic acid which weathers limestone.

• O2 in the air mixes with rainwater to create carbonic acid which weathers limestone.

• Sulphur in the air mixes with rainwater to create carbonic acid which weathers limestone.

A carbon sink is a store of carbon where...

• INPUTS of carbon are greater than OUTPUTS

• OUTPUTS of carbon are greater than INPUTS.

• Carbon sequestration is occurring.

• A tipping point has been reached.