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What is the largest carbon sink in the world?

• The Amazon
• The Oceans
• The Deserts
• The Forests

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Most greenhouse gases are given off by trees.

• true
• false

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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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Why does cutting down trees increase global warming?

• trees soak up carbon dioxide
• trees provide shade which counteracts global warming
• trees absorbs the sun's energy without radiating back into the atmosphere
• trees drain greenhouse gases like methane from soil

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Ultimately, all biofuels are ________, because they are the result of ________.

• geological; sedimentation
• solar; photosynthesis 
• inefficient; decomposition by microorganisms
• synthetic; chemical manipulation of hydrocarbons

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Living vegetation and the ocean are known as "carbon sinks" because

• they are made of carbon.

• they create carbon.

• they destroy carbon.

• they store carbon.

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Productivity in an ecosystem has to do with

• Efficiency of its primary producers

• The number of different species living in the ecosystem

• Its longevity

• Its rate of producing biomass

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Which of the following is a carbon SINK?

• Photosynthesis

• Respiration

• Combustion

• Forest fires

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

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

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Carbon is stored in

• Trees

• Living things

• fossil fuels

• All are correct

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