Water exists in all three phases (solid, liquid, and vapor) on Earth's surface because of the presence of bonds.

Hydrogen bond

Explanation:

Hydrogen bonds are usually referred to those bond that commonly occurs when a highly electronegative atom like fluorine, nitrogen or oxygen atom is attached to the hydrogen atom. For example, in water, the oxygen atom is attached with two hydrogen atoms and due to the difference in their electronegativity, there is a partial positive charge on hydrogen atom and a partial negative charge on the oxygen atom.

Hydrogen bonds are not actually considered to be true bonds like other bonds. They are comparatively much weaker bonds. This bond is responsible for the increasing cohesiveness between the water molecules, that enables them to cling to one another.

Due to the presence of this bond, water can exist in all three phases on the surface of the earth.

the atomic mass is the bottom number on the element.

-steel jelly