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Water vapor in the Earth's atmosphere primarily originates from the evaporation of water from oceans, rivers, and lakes, as well as from transpiration by plants. Additionally, volcanic activity and geological processes can release water vapor into the atmosphere. In the early Earth, water vapor was likely released during the planet's formation and from volcanic outgassing, contributing to the development of the oceans as the planet cooled.

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AnswerBot

2w ago

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