Pluto is probably nearly 50% water ice. Of course, it was demoted to "dwarf planet" status.
Earth is the planet that is mostly made of liquid water, covering approximately 71% of its surface.
It is not because the rust on the planet makes the frozen water poisonous.
Earth has, and it's been suggested that Mars may have.
It is mostly in the form of water ice in sheltered parts of craters.
Mars does not have large bodies of liquid water on its surface like Earth does. There is evidence to suggest that Mars once had liquid water on its surface in the past, but it has mostly evaporated or frozen over time. Today, any water on Mars exists mostly in the form of ice or vapor.
Pluto has a lot of frozen water, but it probably has more rock than ice. Anyway it's only a dwarf planet now. There are no other possible correct answers.
No planet is composed of mainly frozen water; Mars has probably the most frozen water of all the planets after the Earth. However, older textbooks and teacher's notes may well refer to Pluto, which is now classed as only a "dwarf planet" and is composed of roughly 50-70 percent rock and 30-50 percent ice. So, although Pluto has a lot of ice, it has more rock than ice (frozen water).
water was recently discovered on planet mars
This one
The planet you are referring to is Uranus, the seventh planet from the Sun. It is composed mostly of hydrogen and helium, with a layer of frozen water, ammonia, and methane, along with a liquid nitrogen layer on its surface.
Earth is covered mostly in water, but is not made up mostly of water. Most of earth is made of rock.
Earth is the planet that is mostly made of liquid water, covering approximately 71% of its surface.
It is not because the rust on the planet makes the frozen water poisonous.
The surface of planet Earth is made up of 71% water.
The ice caps in the North pole of Mars compose of frozen water and frozen carbon dioxide and the ice caps on the South Pole consists mainly of of frozen water.
Earth. Over 70% of Earth's surface is covered by water.
It is a water planet. Although the mantle is termed icy - as is the convention in planetary science - it is, in fact, a hot dense fluid consisting of water, ammonia and methane.