water cycle - the movement of water from the air to and below the Earth's surface and back into the air
evaporation - water changing into vapour and rising into the air
condensation - water vapour changing back into liquid
precipitation - water falling toward the Earth's surface in the form of rain, drizzle, hail, sleet, or snow
transpiration - evaporation of water through the leaves of plants
infiltration (also called percolation) - the entrance or flow of water into the soil, sediment or rocks of the Earth's surface
glacier - a large mass of ice formed on land by the compacting and recrystallisation of snow; glaciers survive from year to year, and creep downslope or outward due to the stress of their own weight
groundwater - water under ground, such as in wells, springs and aquifers
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Nearly three-fourths of the Earth’s surface is covered with water. Perhaps the most important liquid in the world, water is usually easy to get from rain, springs, wells, streams, rivers, ponds, and lakes. It fills the vast ocean beds. As vapour, water is also present in the air, where it often condenses into clouds. The bodies of most living things contain a large proportion of water.
Earth’s water has a profound effect on where and how people live. Although all water is important, it is fresh water that is needed to sustain life.
Encyclopedia Britannica Inc, 2015
E 2017 14:36
Clean water is essential for human existence. However, international requirements are not met by the available supply. This programme examines rising global water demand and some of the serious issues with inadequate and/or contaminated water supplies.
E 2017 15:02
This programme explores British water supply and demand, and examples of water management programs across the country, including initiatives incorporated in London's Olympic Park.
E 2013 3:26
This motion-graphics based clip takes the viewer through the keys stages of the water cycle including: evaporation and transpiration; condensation, precipitation, and surface run-off.
