The video explains the carbon cycle, highlighting carbon's essential role in living organisms and the atmosphere. It describes how carbon cycles through the atmosphere, terrestrial biosphere, Earth's interior, ocean, and human influence. Carbon exists in the atmosphere as carbon dioxide and methane, absorbed by plants and oceans. The terrestrial biosphere involves carbon exchange between plants, animals, and soil. Carbon is stored in the Earth's interior as fossil fuels and released by volcanoes. The ocean plays a significant role in carbon exchange, with plankton absorbing carbon dioxide. Human activities like burning fossil fuels and deforestation increase atmospheric carbon levels.

Why is carbon considered vital to most living organisms on Earth?

• It is a key component of water.

• It is essential for photosynthesis.

• It is a major part of the Earth's crust.

• It is used in cellular respiration.

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In what forms is carbon found in the atmosphere?

• Carbon monoxide and carbon dioxide

• Carbon dioxide and methane

• Methane and carbon monoxide

• Carbonic acid and carbon dioxide

How do autotrophs like plants and plankton use atmospheric carbon?

• For decomposition

• For digestion

• For photosynthesis

• For cellular respiration

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What happens when carbon is absorbed by the ocean?

• It becomes limestone.

• It forms carbon monoxide.

• It creates carbonic acid.

• It turns into methane.

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What is the role of decomposers in the carbon cycle within the terrestrial biosphere?

• They convert carbon into methane.

• They store carbon in fossil fuels.

• They release carbon into the atmosphere and soil.

• They absorb carbon dioxide for photosynthesis.

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Which of the following is NOT a fossil fuel?

• Limestone

• Natural gas

• Coal

• Oil

How can volcanoes affect the carbon cycle?

• By creating carbonic acid in the ocean

• By releasing stored carbon when they erupt

• By absorbing carbon dioxide from the atmosphere

• By converting carbon into fossil fuels

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Which location has the greatest exchange quantity of cycled carbon?

• The atmosphere

• The terrestrial biosphere

• The ocean

• The Earth's interior

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How do humans influence the carbon cycle through deforestation?

• By increasing the amount of carbon in the atmosphere

• By decreasing the amount of carbon in the ocean

• By converting carbon into fossil fuels

• By reducing the amount of carbonic acid in the ocean

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What is clinker, and how does its production affect the carbon cycle?

• A type of decomposer that releases carbon

• A byproduct of photosynthesis that stores carbon

• A component of cement that releases carbon

• A type of fossil fuel that absorbs carbon

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