Might need to define “the water”. The water on earth in general? The water out of your tap, water as a substance?
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If you mean originally, we don’t actually know. The current theory is that it’s from frozen meteors putting space ice onto our planet over billions of years.
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Comets & asteroids over billions of years.
also, deep within the mantel there are minerals like ringwoodite that at some point during their life decay and under the right circumstances form H2o
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