Water Cycle & Carbon Cycle

Humans burn fossil fuels and wood, releasing carbon dioxide into the atmosphere. This carbon dioxide is then absorbed by trees for photosynthesis. These processes are contributory to which chemical cycle?

• The carbon cycle
• The phosphorous cycle
• The water cycle
• The nitrogen cycle
• The sulfur cycle

In the carbon cycle, animals can release carbon back into the cycle through __________ or through __________.

• burning . . . photosynthesis
• respiration . . . decomposition
• respiration . . . photosynthesis
• decomposition . . . photosynthesis
• fixation . . . decomposition

What provides the energy needed for evaporation to occur naturally in the water cycle?

• wind
• rivers
• soil
• sun

If a forest fire occurs, what will happen to the carbon in the forest?

• It will go into the soil
• It will be destroyed
• It will go into the atmosphere
• It will runoff into nearby streams and rivers

Where does all the carbon in organisms originate from?

• Water
• Earth's atmosphere
• Rocks
• Soil

What kind of organism sequesters the most carbon from the atmosphere?

• Animals
• Archaea
• Bacteria
• Insects
• Plants

Carbon is taken from the air to make food by the process of:

• Photosynthesis
• Decomposition
• Cellular respiration
• Evaporation
• None of these are true

Living organisms return carbon back to the atmosphere in the form of CO2 through which process?

• Photosynthesis
• Respiration
• Decomposition
• Glucose creation
• All answers are true

The amount of carbon in the atmosphere is:

• Increasing
• Decreasing
• Staying the same

Respiration is the process by which ____________ is consumed and _______________ is produced.

• carbon dioxide, oxygen
• carbon dioxide, energy
• oxygen, carbon dioxide
• energy, carbon dioxide