Carbon Cycle

What is the basis for life in all living organisms?

• Hydrogen

• Nitrogen

• Carbon

• Oxygen

What process do plants use to take carbon out of the atmosphere?

• Photosynthesis

• Decay

• Combustion

• Respiration

What happens when fossil fuels are burned?

• Water is released into the atmosphere

• Oxygen is released into the atmosphere

• Carbon is released into the atmosphere

• Carbon is removed from the atmosphere

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

• 10%

• 18%

• 25%

• 30%

What is a negative effect of too much carbonic acid in the ocean?

• It causes acid rain

• It helps marine life

• It increases oxygen levels

• It creates more shells