The carbon cycle was the natural process of carbon conversion through the various features of a planet. In 2269, Commander Spock of the Enterprise detected signs of a carbon cycle on an apparently uninhabitable planet of Excalbia. This prompted further investigation, leading to first contact between the United Federation of Planets and the Excalbians. (TOS: "The Savage Curtain" )
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| - The carbon cycle was the natural process of carbon conversion through the various features of a planet. In 2269, Commander Spock of the Enterprise detected signs of a carbon cycle on an apparently uninhabitable planet of Excalbia. This prompted further investigation, leading to first contact between the United Federation of Planets and the Excalbians. (TOS: "The Savage Curtain" )
- The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Along with the nitrogen cycle and the water cycle, the carbon cycle comprises a sequence of events that are key to making the Earth capable of sustaining life; it describes the movement of carbon as it is recycled and reused throughout the biosphere. The carbon cycle was initially discovered by Joseph Priestley and Antoine Lavoisier, and popularized by Humphry Davy.
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| - The carbon cycle was the natural process of carbon conversion through the various features of a planet. In 2269, Commander Spock of the Enterprise detected signs of a carbon cycle on an apparently uninhabitable planet of Excalbia. This prompted further investigation, leading to first contact between the United Federation of Planets and the Excalbians. (TOS: "The Savage Curtain" )
- The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Along with the nitrogen cycle and the water cycle, the carbon cycle comprises a sequence of events that are key to making the Earth capable of sustaining life; it describes the movement of carbon as it is recycled and reused throughout the biosphere. The global carbon budget is the balance of the exchanges (incomes and losses) of carbon between the carbon reservoirs or between one specific loop (e.g., atmosphere ↔ biosphere) of the carbon cycle. An examination of the carbon budget of a pool or reservoir can provide information about whether the pool or reservoir is functioning as a source or sink for carbon dioxide. The carbon cycle was initially discovered by Joseph Priestley and Antoine Lavoisier, and popularized by Humphry Davy.
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