Unit 4 Matter a Energy Transformation (Carbon Cycle)

All of the carbon in existence is continually recycled in the carbon cycle

• True
• False

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Combustion is another word for __________.

• Transportation
• Respiration
• Fossil Fuels
• Burning

Carbon can be found in...

• The atmosphere
• Soil
• Fossil fuels
• All of the above

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

• Water
• Atmosphere
• Sun
• Air

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

• respiration (breathing) and photosynthesis

• decomposition and respiration

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

• Waste products

• Photosynthesis

• Cellular respiration

• Formation of glucose

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Through the process of photosynthesis, plants take in ________________ to make ______________________.

• CO₂, O₂

• O₂, CO₂

• H₂O, CO₂

• H₂, O₂

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How do humans add carbon dioxide to the atmosphere?

• Through photosynthesis and burning fossil fuels

• Through cellular respiration, burning biomass and burning fossil fuels in cars and factories

• By garbage decomposition

• Through eating plants and animals and cutting down forests

Which process takes in carbon dioxide and releases oxygen?

• combustion

• photosynthesis

• cellular repiration

• decomposition

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What are the products made from photosynthesis?

• carbon dioxide and water

• oxygen and glucose

• glucose and carbon dioxide

• water and glucose

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