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I understand there are other possibility your not considering that water came from rocks of the earth ,Again no one knows this for FACT there no way to prove it over other possibly,



Geoscientists continue to debate two competing theories. One suggests that Earth’s water might have been captured from asteroids and comets that collided with the planet. But recent research has strengthened the case for the other theory that water was always present in the rocks of the Earth’s mantle and was gradually released to the surface through volcanoes. Working out which mechanism was more important would not only give us a better understanding of the Earth’s history but also help us in the search for other planets that could support life.


Again science thinks but no way to prove which one is right .

Science and theory chance often .


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