Carbon Cycle Quiz

What is the carbon cycle closely tied to?

• The nitrogen cycle

• The oxygen cycle

• The water cycle

• The sulfur cycle

What percentage of the human body is made up of carbon?

• 10%

• 18%

• 25%

• 30%

What do some aquatic organisms use to make their shells?

• Calcium carbonate

• Sodium chloride

• Magnesium sulfate

• Potassium nitrate

What can too much carbon in the ocean create?

• Sulfuric acid

• Nitric acid

• Carbonic acid

• Hydrochloric acid

What are processes that take carbon out of the atmosphere called?

• Sources

• Sinks

• Reservoirs

• Pools

What process puts carbon back into the atmosphere when we exhale?

• Photosynthesis

• Combustion

• Respiration

• Decomposition

How does carbon return to the environment through the decay of plants and animals?

What process releases carbon into the air when trees, plants, or fossil fuels burn?

• Photosynthesis

• Combustion

• Respiration

• Decomposition

What human activity puts a lot of carbon back into the air?

• Planting trees

• Burning fossil fuels

• Recycling

• Using solar energy

What human activity reduces how much carbon is removed from the atmosphere?

• Deforestation

• Reforestation

• Composting

• Using electric cars