water cycle


Also found in: Dictionary, Wikipedia.

water cycle

the circulation of the earth's water, in which water evaporates from the sea into the atmosphere, where it condenses and falls as rain or snow, returning to the sea by rivers or returning to the atmosphere by evapotranspiration

Water Cycle

 

the continuous migration of water on earth (in its atmosphere, hydrosphere, and crust), accompanied by phase transitions of the water and possessing a more or less pronounced cyclical character.

The water cycle consists of the evaporation of water from the underlying surface and its transport by air currents from the evaporation site, condensation of water vapor, precipitation, and shifting of water in bodies of water over the land surface and within the earth’s crust. Most of the water evaporates from the oceans and returns to them; less is transported by air currents from the oceans to land. The transport of moisture evaporating from land to the oceans by air currents is slight. The water cycle is characterized quantitatively by the water balance.

A small cycle—sea (ocean) → atmosphere → sea (ocean)— and a large cycle—ocean → atmosphere → land — ocean—are distinguished according to the site of the evaporation and precipitation of water and the modes of its transport. Moisture repeatedly evaporates from the continents, is transported in the atmosphere, condenses, and again falls in the form of precipitation and again evaporates. This complex of processes is called the intracontinental cycle. An internal moisture cycle is characteristic of closed intermontane basins. The water cycle on the earth is part of the total complex of processes participating in the cycle of matter on the earth. (See alsoHYDROLOGIC CYCLE.)

K. G. TIKHOTSKII

water cycle

[′wȯd·ər ‚sī·kəl]
(hydrology)
References in periodicals archive ?
"Here we report observations of this water cycle, specifically detections of near-surface water released into the lunar exosphere by the Neutral Mass Spectrometer on the Lunar Atmosphere and Dust Environment Explorer," the research team wrote on the paper.
By building a terrarium, we can observe the water cycle and learn how it works on Earth to grow plants.
Regardless, the lake of water has exposed the old Murree Road and many of the boats and water cycles appear to be lying on dry land; a depressing sight for Rawal Lake's many visitors.
The facts behind the water cycle are clearly and simply explained in small chunks, through a combination of text and image.
Your teacher stands in front of the classroom and delivers an ultimatum: "If you don't understand the water cycle, your mission will fail." You study the intricacies of clear blue water, how it fuels everything in life.
Water body on planet earth remains constant but changes from one form to another through water cycle. Water cycle continuously moves water on, above and below the earth's surface.This water movement is attributed by a wide range ofclimatic variables including atmospheric (air, temperature, wind speed and direction etc), oceanic (sea surface temperature, sea surface salinity, sea level etc) and terrestrial (water discharge, water use, land cover, glaciers etc).
'The water cycle and the carbon cycle are tightly linked with plants acting as a medium between the two,' says Ana Barros, Environmental Engineer at the university and co-author of the research.
These techniques include Evolutionary programming, simulated annealing, Bacterial foraging, Harmony search algorithm, Ant colony optimization, Genetic algorithm, bat optimization and water cycle optimization algorithm as in [8]-[10].
In this lyrical look at the water cycle, Miranda Paul explores the many forms water can take.
Following this, there was a competition around water conservation and the water cycle. The goal was to educate the next generation on how to conserve water and the vital role the water cycle plays in nature.
This important book explains how the Earth's supply of water moves from bodies of water to the atmosphere and to land in a process called the water cycle. Processes such as transpiration, evaporation, condensation and precipitation are explained.