Earth's water supply originated from

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The majority of Earth's water supply is believed to have originated from outgassing, which means water vapor and other gases were released from the Earth's interior through volcanic activity. As the Earth cooled, water vapor condensed to form liquid water, which collected in low-lying areas to form oceans, lakes, and rivers. Some water may have also arrived on Earth through asteroids, but this is believed to be a minor source of Earth's water supply. Solar wind and photosynthesis played no significant role in the origin of Earth's water supply.

Earth's Water Supply Originated from