2018 Carbon Cycle

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

Which one of these does not add CO2 to the atmosphere?

• cooking with gas
• planting trees
• burning wood
• riding in a bus

How do living organisms return carbon to the atmosphere in the carbon cycle?

• respiration and photosynthesis
•  decomposition and respiration

In the carbon cycle, producers take in the gas __

• carbon dioxide
• oxygen
• nitrogen
• carbon monoxide

In what process is Carbon transformed into chemical energy?

• Photosynthesis
• Respiration
• Primary Production
• Secondary Production

If the plant population decreased, the amount of carbon would _________.

• Stay the same
• Increase
• Decrease

Why is the ocean important to the carbon cycle?

• It keeps sediment containing carbon underwater for millions of years
• The ocean gives out more carbon then it takes in (increases global warming)
• The ocean isn't important to the carbon cycle.

Why is the ocean important to the carbon cycle?

• It keeps sediment containing carbon underwater for millions of years
• The ocean gives out more carbon then it takes in (increases global warming)
• The ocean isn't important to the carbon cycle.

What is carbon used for in humans?

• a. Our DNA contains carbon

• b. It is used in making proteins

• c. It makes up our nitrogen compounds

• answer a and b are correct

• answer a and c are correct.

What sphere does an animal’s or plant’s carbon go when it dies?

• Atmosphere

• Hydrosphere

• Geosphere/Lithosphere

• Biosphere