There are only a few ways Earth could have gotten its water.
1. Water was present when Earth was originally formed from the gas and dust cloud that created the solar system and was part of the original mass that condensed to form Earth.
2. Water was delivered to Earth after the initial formation, primarily in the form of a cometary bombardment. Comets at the time of Earth's early years would have been nearly the same composition, with much water, as they are now. There is much reason to believe that all planets have had significant bombardments.
3. Water, was formed by combining hydrogen and oxygen through chemical processes to form water after the initial formation of Earth. (There are good chemistry reasons to expect this was unlikely.)
Though all three occurred to some degree, the real debate is over how much. Certainly, a lot of water was present during the formation of Earth. The last possibility of additional water being added through a chemical process is believed to have been a very minor factor. The real question that remains is whether extraterrestrial sources, like comets, provided most or only a little water.
A more thorough discussion of these and other possibilities is provided in the related links.
Wiki User
∙ 7y agoWiki User
∙ 12y agoVolcanic outgassing
puddles
Water gets into the air by a process known as evaporation.
absorbed by earth surfaces, land and water
when the water falls on the ground it enters in to the layers of the earth first it enters in to the crust and then mantle through out this process water gets purified
Currently all the "new water" is formed by biological means - mostly animals "burning" food. (And it (water) gets unmade by plants.)
puddles
Water gets into the air by a process known as evaporation.
The water cycle start from earth's surface. Water gets evaporated from the surface.
The shuttle takes water from Earth and gets electricity from solar panels.
Evaporation occurs at earth's surface. Water gets evaporated to air.
absorbed by earth surfaces, land and water
It gets absorbed into the Earth.
So it can be recycled and used on the Earth repeatedly(rain, snow, etc.)
It gets to the Earth by RADIATION.
how a spqaceship gets out of earth's gravity
when the water falls on the ground it enters in to the layers of the earth first it enters in to the crust and then mantle through out this process water gets purified
Currently all the "new water" is formed by biological means - mostly animals "burning" food. (And it (water) gets unmade by plants.)