Carbon Cycle

What do all living things need for their structure?

• Nitrogen

• Carbon

• Glucose

• Starch

What does carbon dioxide do on earth?

• Regulate the temperature

• Provide living organisms with their structure

• Help plants create glucose

• All of the above

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How are fossil fuels created?

• Plants are harvested and turned into fuel

• Scientists combine different chemicals in a lab

• Decomposing organisms are buried and overtime tons of pressure is placed on these dead organisms

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How does carbon dioxide get into the ocean water?

• Solid pieces of carbon are dissolved in the water

• Carbon dioxide dissolves easily in the water

• There is no carbon dioxide in the ocean

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Carbon dioxide is a product of burning fossil fuels.

• True

• False

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What happens when there is too much CO2 in the atmosphere?

• It prevents suns energy from reradiating back out into space

• It causes an abundance of plant growth

• It becomes difficult to breathe outside

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What is one source of carbon?

• Water from the river

• Sunlight

• Fossils

Why are scientists worried about the ice caps melting?

• Melting ice causes a change in land mass

• Melting ice releases CO₂ that was trapped in the ice

• Melting ice releases ancient bacteria that could be dangerous

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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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In the carbon cycle, animals can release carbon back into the cycle through __________ or through __________.

• burning . . . photosynthesis

• fixation . . . decomposition

• decomposition . . . photosynthesis

• respiration . . . decomposition

• respiration . . . photosynthesis