Which statement best describes carbon sinks and sources in the carbon cycle?

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Multiple Choice

Which statement best describes carbon sinks and sources in the carbon cycle?

Carbon sinks remove CO2 from the atmosphere, while carbon sources release CO2 back into the air. In the carbon cycle, the atmosphere exchanges CO2 with oceans and land. Oceans dissolve CO2 and plants take it up during photosynthesis, acting as sinks. Conversely, processes like respiration, decomposition, volcanic activity, and burning fossil fuels release CO2, making those parts of the system sources. The balance between these sink and source processes determines how much CO2 remains in the atmosphere. While many sinks remove CO2, some systems can release CO2 under certain conditions (for example, warmer oceans can outgas CO2), but the simplest and most accurate description of their roles is that sinks remove and sources release.

Carbon sinks remove CO2 from the atmosphere, while carbon sources release CO2 back into the air. In the carbon cycle, the atmosphere exchanges CO2 with oceans and land. Oceans dissolve CO2 and plants take it up during photosynthesis, acting as sinks. Conversely, processes like respiration, decomposition, volcanic activity, and burning fossil fuels release CO2, making those parts of the system sources. The balance between these sink and source processes determines how much CO2 remains in the atmosphere. While many sinks remove CO2, some systems can release CO2 under certain conditions (for example, warmer oceans can outgas CO2), but the simplest and most accurate description of their roles is that sinks remove and sources release.

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