The majority of the carbon in the cypress tree's trunk was absorbed by the tree when it ingested carbon dioxide molecules from the atmosphere.
It is an amalgam of many gases. Approximately 78% of the air in Earth's atmosphere is nitrogen, while 21% is oxygen. Small amounts of other gases, including carbon dioxide, neon, and hydrogen, are also present in air.
Because of radiation from the Sun, early Earth lost its hydrogen, helium, and other hydrogen-containing gases, leaving it without an atmosphere. Gases locked in the early Earth's interior were released, creating the first atmosphere, a process that continues today in volcanoes.
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