Question

where water has come from
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Answer 1

Explanation:

Much of Earth's water is thought to have come from asteroids impacting the planet early in its history. Image via NASA/Don Davis. The surface of the very young Earth was initially an ocean of magma. Hydrogen and noble gases from the solar nebula were drawn to the planetary embryo, forming the first atmosphere.

Answer 2

Answer:

The water comes from the asteroids impacting.