If it were, you'd be swimming right now. Earth is part water, part land. About 60 to 70% water, and the rest land.
earth
Earth.
Earth is the planet that is mostly made of liquid water, covering approximately 71% of its surface.
Earth
Earth..?
The question seems poorly worded, but Earth is the planet with liquid water on its surface.
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.
Earth
Earth, because it is the only planet with liquid water.
It's the Earth.
Earth is the only planet known to have liquid water oceans on its surface.
Water does exist on Earth. Earth is the only planet known to have liquid water.