Carbon in the Global Ecosystem

What is one way that factories contribute to carbon emissions in the atmosphere?

• By using renewable energy sources

• By burning fossil fuels

• By planting trees

• By recycling waste

The carbon that makes up carbon dioxide comes from:

• fossil fuels

• volcanic eruptions

• respiration of living organisms

• all of the above

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Fossil fuels are:

• Renewable energy sources

• Non-renewable energy sources

• A type of mineral

• A form of nuclear energy

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What is the main source of energy mentioned in the passage that powers modern human lifestyle?

• Solar energy

• Fossil fuels

• Wind energy

• Nuclear energy

Coal, oil, and gas are called 'fossil fuels' because:

• They are made from fossils of dinosaurs.

• They are formed from the remains of ancient plants and animals.

• They are found only in fossilized form.

• They are used to preserve fossils.

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What happens when fossil fuels are burned?

• They release oxygen into the atmosphere.

• They produce energy and release carbon dioxide.

• They turn into renewable energy sources.

• They cool down the environment.

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Which of the following is a consequence of burning fossil fuels?

• Decrease in carbon dioxide levels

• Increase in carbon dioxide levels

• No change in carbon dioxide levels

• Decrease in oxygen levels

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What is the main topic discussed in the passage?

• The main topic discussed in the passage is climate change.

• The main topic discussed in the passage is economic growth.

• The main topic discussed in the passage is technological advancement.

• The main topic discussed in the passage is healthcare reform.

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According to the passage, what powers the carbon cycle?

• The Sun

• Wind

• Water

• Soil

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Which processes are mentioned in the passage as part of the carbon cycle?

• Photosynthesis and respiration

• Evaporation and condensation

• Erosion and sedimentation

• Melting and freezing

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