Cycles in Nature

Which process is responsible for the release of oxygen into the atmosphere?

• Consumption

• Respiration

• Photosynthesis

• Perspiration

Which cycle involves condensation, evaporation, and precipitation?

• The water cycle

• The carbon cycle

• The nitrogen cycle

• The motor cycle

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

• Water
• Atmosphere
• Sun
• Air

In the carbon cycle, producers take in the gas __

• carbon dioxide
• oxygen
• nitrogen
• carbon monoxide

All of the carbon in existence is continually recycled in the carbon cycle

• True
• False

Where is carbon stored in the environment?

• Fossil fuels
• Wood of trees
• Calcium carbonate (shells and bones)
• All of the above

What is the largest reservoir for water?

• the ocean

• rocks and minerals

• the atmosphere

• glaciers

Carbon dioxide is added to the atmosphere by

• Burning fossil fuels 
• Cellular respiration
• Decomposing organic matter
• All answers are correct

Which of the following is represented in this picture?

• the water cycle

• the carbon cycle

• the nitrogen cycle

• the hydrogen cycle

Which of the following is represented in this picture?

• the water cycle

• the carbon cycle

• the nitrogen cycle

• the hydrogen cycle