Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle

How does carbon dioxide leave the atmosphere and become part of the food chain?

• Through transpiration
• Through photosynthesis
• Through factory emission
• Sunlight

How do animals get the carbon they need?

• decomposing
• combustion
• eating plants 
• breathing it in

What role do animals play in the carbon cycle?

• absorb carbon dioxide from the atmosphere
• give off carbon dioxide through respiration
• combustion
• decomposing matter

What is one way that carbon dioxide can be put back into the atmosphere?

• Sunlight
• Burning of Fossil Fuels
• Ocean uptake
• Rain

What role do decomposers play in the carbon cycle?

• absorb carbon dioxide 
• release carbon dioxide into atmosphere
• return carbon into the soil
• combustion

In the carbon cycle, what is the role of volcanic activity?

• releases carbon dioxide into the atmosphere into the air
• decomposing matter back into the soil
• absorbing carbon dioxide from the atmosphere
• combustion

When carbon combines with 2 oxygen atoms, what forms?

• Nitrogen
• Argon
• Carbon dioxide
• Sodium hydrogen

How have humans contributed to the amount of carbon dioxide in the air?

• driving cars
• burning coal
• factories
• all of these

Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle