Final answer:
The distance between the planet and the Sun allows water to exist as a liquid on Earth.
Step-by-step explanation:
One of the characteristics of Earth that allows water to exist as a liquid is the distance between the planet and the Sun. Earth is located at an optimal distance from the Sun, known as the habitable zone, where temperatures are just right to keep water in its liquid state. If a planet is too close to the Sun, water will evaporate, and if it is too far, water will freeze.
Learn more about Conditions for life on a planet