I presume when you say "form" you mean state, and if I presume correctly the answer is all three states: gas, liquid and solid. However, liquid is the most predominate state.
Yes it does. Actually it has the same forms as planet Earth does.
The presence of liquid water on its surface. Earth is the only known planet in our solar system and, so far, in the universe where water exists in liquid form, a key ingredient for supporting life as we know it.
water used to be found in mars but now it is said that there is a new planet named UB13 that is similar to the earth and contains water
Earth is the only planet in our solar system with an abundance of liquid water on its surface. Other planets may have water in the form of ice or vapor, but not in liquid form like Earth.
Ocean planets have been hypothesised, where the planet is dominated by water coverage and no land. An exoplanet (a planet in another solar system, orbiting another star) called GJ 1214 b is a possible candidate for an ocean planet.
The most abundant form of water on Earth is liquid.
The Earth is sometimes called the "Blue Planet" or "Water Planet" because it is the only known planet that has large amounts of liquid water. Water bridges the gap to life, so water makes it possible for the Earth to support life.
The planet s that have ice on their poles are earth mars, and no others that we know of now
no it wont decrease at all because water evaporates but can return to its normal form
a large ice asteroid came form space and hit earth malt with volcano
Most of Earth's water is found in the liquid phase.
Mars has water in the form of ice, and as water vapor in its atmosphere like the earth.