carbon cycle

Front

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide. Options: Water, Atmosphere, Sun, Air

Back

Atmosphere

Front

Which one of these does not add CO2 to the atmosphere? Options: cooking with gas, planting trees, burning wood, riding in a bus

Back

planting trees

Front

What does not produce carbon dioxide? Options: Photosynthesis, Burning Fossil Fuels, Animal respiration, Plants decaying

Back

Photosynthesis

Front

How do living organisms return carbon to the atmosphere in the carbon cycle?

Back

decomposition and respiration

Front

In the carbon cycle, producers take in the gas __

Back

carbon dioxide

Front

Which of the following removes carbon from the atmosphere? Options: Combustion, Respiration, Photosynthesis, Death

Back

Photosynthesis

Front

What process occurs when coal (fossil fuel) is used for energy?

Back

Combustion

Front

Respiration is the process by which animals take in _____ and release _____.

Back

oxygen, carbon dioxide

Front

Which of the following are mainly cycled through the processes of photosynthesis and cellular respiration?
Options:

carbon and sulfur

,

carbon dioxide and oxygen

,

carbon and nitrogen

,

nitrogen and sulfur

Back

carbon dioxide and oxygen

Front

Forests are a carbon sink. This means that they...

Back

remove carbon dioxide from the atmosphere