Question

how does water is formed on earth​

Answer 1

Gradual "dehydration melting"—leakage of water stored in hydrate minerals of Earth's rocks—could haveformed a portion of its water. Watermay also have come from volcanism:water vapor in the atmosphere that originated in volcanic eruptions may have condensed to form rain, slowly filling Earth's oceanic basins.

Answer 2

here is your answer hope it helps you