How did water get to earth?

Question

back in time how did water land here? i mean if earth was created it was prob covered in lava and c**p, so when everything dried how did water get here? and if say i dont know comets or meteros crashed here bringing water how did they get it?

Answer 1

The question of the origin of water on Earth has not been clarified.

Outgassed volatile components were held in an atmosphere of sufficient pressure for the stabilization and retention of liquid water.

Comets, trans-Neptunian objects or water-rich asteroids (protoplanets) from the outer reaches of the asteroid belt colliding with a pre-historic Earth may have brought water to the world's oceans.Biochemically through mineralization and photosynthesis

Gradual leakage of water stored in hydrous minerals of the Earth's rocks.

Photolysis: radiation can break down chemical bonds on the surface.  

Answer 2

There are lots of good theories, but I think it's important to note that Earth's atmosphere has trapped the water here for billions of years.  It's our atmosphere that makes our planet remarkable.  It's likely that wherever the water came from on Earth is where it came from on other planets, but it evaporates quickly without an atmosphere so no other planets seem to have much of it.  

Answer 3

Steady on leafmusic - our lad here was asking a perfectly sensible question - one that scientists once asked themselves or we wouldn't know now.

Never be afraid to ask questions - it's the best way to learn

http://www.chesapeake.va.us/services/dep...

Answer 4

There's a theory that the Earth 'suffered' a bombardment from comet fragments, which are mostly made of water... Also, Oxygen and Hydrogen are common gases, and when H2 gas is burned (in the presence of oxygen and ignited by lightning), water will form.  

Answer 5

In the initial stage of evolution there are so many volconic activity in the earth. when lava was released in to air,high temp helps oxygen and hydrogen to combine to form steam,when cooled they condensed to form water.which is stable in the normal earth temp..so continous volconoic activity brings more and more water in to the atmospher.which when cooled formed clouds and rain.It continues today also but in lesser scale..  

Answer 6

from what i remember in school lol it is said that the earth had many volcanoes that produced large amounts of sulfur and other waste deposits which formed out atmosphere. After that the by products, hydrogen and water formed and it rained on earth for a loooong time lol and that's how there is water!

Answer 7

During the formation of the Solar System there were billions of comets( which are made up of mainly water, dry ice, and a few other compounds) within the inner solar system. What happened to most of them? Well, the majority either crashed into the Sun or Jupiter, but a good majority also hit other planets and moons. Earth, being the largest target in the inner Solar System, got its fair share and then some. So all these crashed comets, carrying water, left it here for us to enjoy.

Answer 8

Two main sources are most commonly suggested:

1.  Outgassing by voclanoes.  Hydrogen and Oxygen are common and combine easily.  

2.  Comet strikes.  Many comets are composed mainly of ice and rock.  during the accretion cometary impacts were frequent

While the early earth's crust remained hot, water vapor remained in the atmosphere.  When the planet cooled it began to rain, and it rained hard for centuries.  The low spots on the crust filled with water and became oceans.  Then in time anoter large asteroid would hit, the energy released would heat the earth and the oceans would evaporate and the crust would turn to magma.  Then slowly it would cool...  This cycle was probably repeated many times before the asteroids quit falling.