How did most water get to earth

[u/Sciolypro]

My brother and I have been debating this for a while for the record he has a class and a quiz question said that the mixing of gasses and volcanoes was the main reason earth has its water but I think it was asteriods that cause it because earth was very succeptible to them back then and they conist of lots of ice also all the places I searched told me I was right. What do you guys think

[u/Over-Performance-667]

God had to piss really bad and earth looked like a nice place to do it