The Carbon Cycle

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

• Water
• Atmosphere
• Sun
• Air

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Which one of these does not add CO2 to the atmosphere?

• cooking with gas
• planting trees
• burning wood
• riding in a bus

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What does not produce carbon dioxide?

• Photosynthesis
• Burning Fossil Fuels
• Animal respiration
• Plants decaying

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

• respiration and photosynthesis
•  decomposition and respiration

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

• The lion eats the grass
• Carbon from grass doesn't end up in a lion. 
• The carbon ends up in the lion's food chain. 
• The lion breathes in carbon given out by the plant

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Carbon Dioxide is a gas produced by _ and used by _

• plants and animals

• photosynthesis and carbon dioxide

• animals and plants

• carbon dioxide and photosynthesis

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NGSS.MS-LS1-6

Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

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Organisms that do not decompose can be buried and become what?

• water
• nutrients
• air
• fossil fuels

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If the plant population decreased, the amount of carbon would _________.

• Stay the same

• Increase

• Decrease

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NGSS.MS-LS1-6

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Carbon can be found in...?

• The atmosphere

• Inside of the Earth

• Fossil fuels

• All of the above!

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