Water

The water in the oceans, rivers, clouds, and rain is in constant motion. Surface water evaporates, water in the clouds precipitates, and this precipitation runs along and seeps into the Earth. Nonetheless, the total amount of water on the planet does not change. The circulation and 97 % conservation of water is driven by the hydrologic, or water, cycle. This cycle begins with evaporation of water from the Earth's surface. The water vapor humidifies as the air rises. The water vapor in the air cools and condenses onto solid particles as microdroplets. The microdroplets combine to form clouds. When the droplets become large enough, they begin to fall back to Earth, and, depending on the temperature of the atmosphere, they return to the ground as rain, snow, or hail.

seep into = to move or spread slowly through something

humidify = to increase the level of moisture in (air) sweat glands = structures of the skin that produce sweat ascend = to go up precipitation = rain, snow, sleet, or hail that falls to or condenses on the ground permeable = allowing liquids or gases to pass through aquifer [ˈakwɪfə] = a layer of rock, sand, or earth that contains water or allows water to pass through it karstic rock = a soluble type of bedrock, such as limestone, marble, dolomite, or gypsum, that has been chemically dissolved by water, forming a distinct landscape with features like sinkholes, caves, springs, and subterranean drainage systems interstitial water = water located in the tiny spaces or pores between solid particles in substances like soil, sediments, and rocks