Question

Where does water come from?

Answer 1

There is a circle of water. It falls from the sky as rain or snow, on the ground it goes into the stream, the river or gets underground, then it flows into the sea. On its journey, when the temperature is high or the sun shines on it, it turns into steam and flies to the sky again, where much of them form the clouds. When the clouds are thick and heavy, it will create rain or snow, so the water comes back to the earth again.

in the rain...
in the snow...
in the clouds...
in the underground rivers...
in the pools...

追问

how did water form？

追答

The origin of the understanding of water still exist significant differences, present in about 32 of the water. Here introduced several kinds of main theories. A theory that the existence of a H2O molecule on the earth before the formation of the initial material in the original nebula, similar to the current average moisture content 0.5% of meteorites, the earth was formed after the fall to the earth, so that the water on the earth. Another theory that the formation of the earth after the original elements to form water (hydrogen and oxygen). Hydrogen and oxygen in suitable conditions. Generation of hydroxyl (OH). Hydroxy after complex changes, the formation of water (H2O).