carbon cycle2

What does NOT produce carbon dioxide?

• Photosynthesis
• Burning Fossil Fuels
• Animal respiration
• Plants decaying

Combustion is another word for __________.

• Transportation
• Respiration
• Fossil Fuels
• Burning

TRUE or FALSE?
All of the carbon in existence is continually recycled in the carbon cycle.

• True
• False

Organisms that do not decompose can be buried and become what?

• water
• nutrients
• air
• fossil fuels

Carbon can be found in...

• The atmosphere
• Soil
• Fossil fuels
• All of the above

Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

What process occurs when coal (fossil fuel) is used for energy?

• Decomposition
• Combustion
• Pressurization 
• Respiration 

Respiration is the process by which animals take in _____ and release _____. 

• photosynthesis, air
• carbon, oxygen
• oxygen
• oxygen, carbon dioxide

The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature?

• lower levels of ozone in the atmosphere
• lower levels of nitrogen in the atmosphere
• higher levels of carbon dioxide and other greenhouse gases in the atmosphere
• higher levels of oxygen in the atmosphere

oxygen is a gas produced by _ and used by  _ 

• plants and animals 
• photosynthesis and carbon dioxide 
• animals and plants 
• carbon dioxide and photosynthesis