Carbon Cycle

Front

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?

Back

The carbon cycle

Front

How does the human body return carbon to the atmosphere in the carbon cycle?

Back

Cellular respiration

Front

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

Back

respiration . . . decomposition

Front

Which of the following is an example of human impact on the carbon cycle?

• The increased production of methane gases from cattle farms
• The burning of fossil fuels
• The cutting down of trees for lumber
• Driving automobiles
• All of the above

Back

All of the above

Front

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

Back

It will go into the atmosphere

Front

Where does all the carbon in organisms (living things) originate from? Options: Earth's atmosphere, Rocks, Water, Soil

Back

Earth's atmosphere

Front

How do organisms (living things) move carbon through the carbon cycle?

Back

Respiration, decomposition, sedimentation, and photosynthesis

Front

By what method is the majority of carbon moved from the lithosphere (upper part of Earth's crust) to the atmosphere? Options: Weathering, Deposition, The burning of fossil fuels, Respiration

Back

The burning of fossil fuels

Front

What kind of organism takes out the most carbon from the atmosphere? Options: Plants, Bacteria, Animals, Humans

Back

Plants