-Gravity (so it doesnt float away)
-Temp (not too hot or cold)
It has a large quantity of liquid water.
Gravity and Temperature
could water exist as a liquid if we don't have a atmosphere
For liquid water to exist on Earth, the planet's surface temperature needs to be within a certain range to keep water in its liquid state. Additionally, Earth's atmosphere plays a crucial role in maintaining the right conditions for liquid water by regulating the temperature and pressure. The presence of Earth's magnetic field also helps protect water from being stripped away by solar winds.
Earth's moderate temperature range and its atmosphere with a stable pressure both contribute to the existence of liquid water on its surface. The temperature range allows for liquid water by maintaining conditions suitable for it to remain in its liquid state, while the atmosphere helps to stabilize those conditions by preventing water from evaporating into space.
The three states of water - solid, liquid, and gas - are unique on Earth due to the range of temperatures and pressures that exist on our planet. Water can exist as a solid in the form of ice, a liquid, or a gas (water vapor) depending on the prevailing conditions. This versatility allows water to play a crucial role in sustaining life on Earth.
Liquid water exists on Earth because the planet's temperature and atmospheric pressure are within a range that allows water to remain in a liquid state. The presence of the greenhouse effect helps regulate Earth's temperature, keeping it suitable for liquid water to be stable. Additionally, the abundance of water vapor in the atmosphere contributes to the formation of liquid water through processes like condensation.
Water can exist in three states, liquid, vapor and as a solid. On the earth, it exists in all three states.
Because the earth's atmosphere creates consistent heat above freezing but bellow evaporating temperature, so the water doesn't freeze but is always effected by gravity. Comets and meteorites that impact earth also carry water. SOME water also melts when in direct sunlight (though not all if the planet/object does not have an atmosphere).
Liquid water.
liquid, solid, and gas :)
solid liquid gas