What does NOT produce carbon dioxide?

• Photosynthesis

• Burning Fossil Fuels

• Animal respiration

• Volcano eruption

Combustion is another word for __________.

• Transportation
• Respiration
• Fossil Fuels
• Burning

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

• water
• nutrients
• air
• fossil fuels

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

if there is a fire in a forest, there will be less ___________ in the environment?

• nitrogen

• oxygen

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

• Stay the same
• Increase
• Decrease

The circulation of the element Carbon among Earth's atmosphere, land, oceans, and organisms is called _____________.

• the Carbon Cycle

• the Oxygen Cycle

• the Carbon dioxide Cycle

• the Water Cycle