The video explains the carbon cycle, highlighting carbon's role as a fundamental element in life on Earth. It describes how carbon is stored in various reservoirs, including rocks, oceans, and the atmosphere, and how it cycles through these systems. The video also covers the role of marine life and fossil fuels in the carbon cycle, emphasizing the continuous nature of carbon recycling in the environment.

What is the significance of carbon in life on Earth?

• It is only found in the atmosphere.

• It is a minor element in living organisms.

• It forms key molecules like proteins and DNA.

• It is not essential for life.

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How does the carbon cycle function in nature?

• Carbon atoms are used once and then discarded.

• Carbon atoms travel from the atmosphere into organisms and back.

• Carbon atoms only stay in the atmosphere.

• Carbon atoms are only found in rocks.

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Where is most of the Earth's carbon stored?

• In the atmosphere.

• In living organisms.

• In rocks and sediments.

• In the ocean.

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What is a carbon sink?

• A place where carbon is destroyed.

• A place where carbon is stored.

• A place where carbon is converted to oxygen.

• A place where carbon is produced.

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How do marine organisms contribute to the carbon cycle?

• They do not contribute to the carbon cycle.

• They only absorb carbon.

• They convert carbon to nitrogen.

• They produce carbon through living and dying.

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What happens to dead organisms in the carbon cycle?

• They become fossil fuels and release CO2 through combustion.

• They disappear without a trace.

• They turn into water.

• They are absorbed by the atmosphere.

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