Overview

water cycle


'water cycle' can also refer to...

water cycle

water cycle

water cycle

water cycle

water cycle

The Global Water Cycle

Global Energy and Water Cycle Experiment

Global Energy and Water Cycle Experiment

Life cycle of the water scorpion, Laccotrephes japonensis, in Japanese rice fields and a pond

Effects of water stress cycles on turgor maintenance processes in pear leaves (Pyrus communis)

Analysis and simulation of modified ammonia/water absorption cycle for power and cooling applications

Interactions of the Water Cycle with Energy, Material Resources, Greenhouse Gas Production, and Land Use

Experimental testing of an innovative Lithium-Bromide water absorption refrigeration cycle coupled with ice storage

Alternative Electron Flows (Water–Water Cycle and Cyclic Electron Flow Around PSI) in Photosynthesis: Molecular Mechanisms and Physiological Functions

Photoinactivation of Ascorbate Peroxidase in Isolated Tobacco Chloroplasts: Galdieria partita APX Maintains the Electron Flux through the Water–Water Cycle in Transplastomic Tobacco Plants

Changes in the Thermal Dissipation and the Electron Flow in the Water–Water Cycle in Rice Grown Under Conditions of Physiologically Low Temperature

Physiological Functions of the Water–Water Cycle (Mehler Reaction) and the Cyclic Electron Flow around PSI in Rice Leaves

Imaging of NPQ and ROS Formation in Tobacco Leaves: Heat Inactivation of the Water–Water Cycle Prevents Down-Regulation of PSII

Physiological traits of two Populus × euramericana clones, Luisa Avanzo and Dorskamp, during a water stress and re-watering cycle

 

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The continuous natural cycling of water from the atmosphere to the land and oceans and back. The basic structure of the global water cycle is quite simple. Water is evaporated from the oceans, seas, lakes, rivers, and vegetated land areas, and it becomes part of the atmospheric store of water vapour. Global and regional wind systems redistribute the water vapour across the Earth's surface. Condensation creates clouds and precipitation, and the latter brings water back to the surface where it enters the soil or groundwater, or flows directly into rivers or lakes. Rivers transport water (as runoff) from land surfaces into the oceans. Naturally, much of the precipitation falls directly over seas and oceans, effectively short‐circuiting the land phase of the water cycle. The total volume of water in the global cycle is estimated at about 1384 million cubic kilometres. Just over 2% of the total water in the global cycle is freshwater, and most of that is locked up as polar ice caps and in glaciers. If all of the ice were to melt it would release enough water to keep the world's rivers flowing at their normal rates for up to 1000 years. The major stores are the oceans (97.41%), ice caps and glaciers (1.9%), groundwater (0.5%), soil moisture (0.01), lakes and rivers (0.009%), and the atmosphere (0.0001%). Also known as the hydrogeological cycle or hydrological cycle.

Fig 21 Water cycle

Subjects: Environmental Science.


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