The boiling point of water is 100 degrees celsius at 1 bar of air pressure, and the boiling point decreases as one gets higher (and the pressure is lower). On mars the air pressure is 7-9% that of the Earth's, meaning that if you melt ice it would immediately turn to water vapor.
I will assume you mean liquid water. The low temperature is one reason.
There probably was water in the past, when conditions were different.
Also the low gravity and low atmospheric pressure mean water would
soon evaporate and disappear into space.
The average atmospheric pressure and temperature on Mars are too low to sustain water in the liquid form. It will freeze immediately.
it's too cold so it freezes and that's why mars has polar ice caps
Atmospheric pressure is an important factor in keeping liquid water on the surface of a planet. With no atmosphere, liquid water would quickly escape into space. It would depend on various factors such as the temperature and escape velocity of the planet of course. Scientists think liquid water existed on Mars in the past when the atmosphere was a lot denser. Water does exist on the surface Mars, but only as ice.
no Not on the surface; some speculate that there may be frozen water beneath the surface.
C.Europa
europa
Europa is the moon that could possibly contain a liquid ocean under its icy surface, and it could possibly be liquid water, or H2O!
The atmosphere is too cold and thin for liquid water today, yet we see evidence that water flowed on the surface in the past.
transpiration,i think
They believe there is liquid water underneath its frozen surface. If there is liquid water on Europa, there might also be life.
evaporation i think but i am not sure
Water is formed as a liquid when steam meets a cold surface.
It is too cold for liquid water to exist on the surface
Gas (water vapor in the air) to liquid (on the surface).
The question seems poorly worded, but Earth is the planet with liquid water on its surface.
Mars has no liquid surface water.
a green liquid
Just Earth.
Just Earth.