Ethan, Luna, and Charlotte are studying the carbon cycle for their science project. They are particularly interested in understanding how carbon enters the atmosphere. Can you help them?

• burning of fossil fuels & biomass

• decomposition

• diffusion from oceans

• volcanic eruptions

• cellular respiration from living things

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How does carbon leave the atmosphere?

• photosynthesis

• cellular respiration

• diffusion into the ocean

• burning matter

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Human activity can increase the amount of atmospheric CO2, usually through the burning of fossil fuels. This contributes to the greenhouse effect and global warming. There are no natural processes that can off-set this increased amount of carbon dioxide. What are three things HUMANS can do specifically to decrease the amount of atmospheric CO2? (3 pts)

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Carbon dioxide is absorbed by producers to make (a)   in photosynthesis.

• oxygen
• carbon
• carbohydrates
• water

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Benjamin, Abigail, and Isla are discussing ways to reduce their carbon footprint. Which of the following actions, if taken by one of them, would not add CO2 to the atmosphere?

• Benjamin cooking with gas

• Abigail planting trees

• Isla burning wood

• Abigail riding in a bus

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Combustion is another word for (a)  

• burning
• melting
• exploding
• incinerating 

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How does the carbon in grass become part of a living animal?

• by eating the grass
• It doesn't end up in the animal no matter what
• It ends up in its food chain
• It breathes in carbon given out by the plant

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Why is the increase in greenhouse gasses an issue

• It causes climate change and increase in the global temperature 
• It can lead to a major increase in greenhouses
• It leads to more factories
• It causes a moajor decrease in people

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Too much carbon dioxide in the atmosphere causes climate change because it (a)   .

• It cools our planet
• Blocks out UV rays
• Traps heat and warms planet
• Lets light escape

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Lily, Evelyn, and Sophia are studying the effects of human activities and natural events on the carbon cycle. They are particularly interested in how the burning of fossil fuels and volcanic eruptions are similar. They understand that both (a)   .

• remove carbon from the atmosphere
• add carbon to the atmosphere
• add carbon to the lithosphere
• remove carbon from the lithosphere

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