Carbon Cycle

Front

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

Back

Carbon Dioxide

Front

Which one of these does not add CO2 to the atmosphere?
burning fossil fuels for electricity,
a tree conducting photosynthesis,
burning wood in the fireplace,
riding in a bus around town

Back

a tree conducting photosynthesis

Front

Combustion is another word for _______________.

Back

burning

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? Options: respiration and photosynthesis, decomposition and respiration

Back

decomposition and respiration

Front

In the carbon cycle, producers take in the gas _______.

Back

carbon dioxide

Front

How does the carbon in grass become part of a lion?

Back

A wildebeest eats the grass and the lion eats the wildebeest.

Front

In what process do producers use light energy and carbon dioxide to produce chemical energy?

Back

Photosynthesis

Front

Oxygen is a gas produced by ___________________.

Back

photosynthesis and used by cellular respiration

Front

Is all of the carbon in existence continually recycled in the carbon cycle?

Back

True