there are river beds which must have Bean carved by water
So far, Earth is the only planet with water. NASA has identified several planets with "potential" to have water.. but they have no solid proof yet.
water exists thanks to comets because it melts or it hits a planet
Planet Venus might have water in it. If it does it is in the form of water vapour. If one of you know for sure that water exists or is not present on Venus please improve my answer.
Earth is the only planet in our solar system where water exists naturally in solid, liquid, and gas states. This is due to its unique distance from the sun and its moderate temperatures that allow for such diverse forms of water.
It could since they found proof of water being there, and also the sun is expanding(very slowley). One day soon it might have life.
Water is abundant in space, the problem is rather that was the water exist in significant amount on any particulars planet.
water, oxygen, moderate temperature and pressure, plants, animals and people
Many speculated about the presence of liquid water and rusted iron on the planet's surface.
The biosphere is the part of Earth where life exists, including the land, water, and atmosphere. It encompasses all living organisms and their environments on the planet.
Homosexuality does not need proof. It definitely exists. Just like the existence of water doesn't need to be proven.
Scientist believe that the planet Mars used to have flowing liquid water. Now, the water on Mars exists almost exclusively as ice.
Water can exist in three states, liquid, vapor and as a solid. On the earth, it exists in all three states.