how did water appear in Earth and how did we end up with such vast amount of it?
In: Earth Science
1. Probably an ice meteor got us started
2. After we had a little bit, primitive life and eventually bacteria started to break down the goop that was primordial Earth and giving us the atmosphere and oceans
As others point out oxygen and hydrogen aren’t really rare in the universe, but the reason we have liquid water and other planets don’t, is because we have an atmosphere which traps sunlight (greenhouse effect) and keeps us cozy and warm. Magnetosphere has a part to play in this as well, since it protects life from all sorts of nasty radiation from the Sun and allows this process to continue.
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