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Some theories regarding the origin of Earth's water say that it was "in" the Earth since it formed and that Volcanoes have brought it to the surface over geologic time.

However, recent scientific work using the isotopic composition of Earth's water point to it having been delivered to Earth by meteorites and comets after the Earth was formed.

This said, volcanoes are certainly part of Earth's current water cycle as areas of hot springs and mid oceanic, black smokers prove.

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