The continuous movement of water through the environment by evaporation, condensation, precipitation, and runoff.

the process by which water is changed from a liquid to a gas (water vapor); a stage of the water cycle.

the mixture of gases that surround a planet.

the process by which water is changed from a gas (water vapor) to a liquid; a stage of the water cycle.

a form of water (e.g. hail, rain, sleet, now) that condenses in the atmosphere and falls to Earth’s surface.

the condition of the atmosphere at a given time and place.

the measure of the amount of water vapor in the air.

the weight of the atmosphere pressing down on Earth.

air that is moving.

the average pattern of weather that occurs in a certain location over many years.