The transformation of water from liquid to gas phases as it moves from the ground or bodies of water into the overlying atmosphere.
The transformation of water vapor to liquid water droplets in the air, creating clouds and fog.
Condensed water vapor that falls to the Earth's surface. Most precipitation occurs as rain, but also includes snow, hail, fog drip, graupel, and sleet.
The variety of ways by which water moves across the land. This includes both surface runoff and channel runoff. As it flows, the water may seep into the ground, evaporate into the air, become stored in lakes or reservoirs, or be extracted for agricultural or other human uses.