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Irrigation
Irrigation
The supply of water to farmland so that crops can grow in areas where natural water supplies are scarce or unreliable.
Water for irrigation comes either from groundwater supplies or from reservoirs and river diversions. (See also: Aqueduct.)
In dry countries irrigation can use more water than all other demands (home, industry, power) put together.
L
Lake
A body of still water not directly connected to the open ocean. Some large lakes are called seas (for example, the Aral Sea).
Most lakes were formed at the end of an Ice Age, when hollows scoured by former glaciers and ice sheets filled with water.
You can find lakes all over the world, but especially in regions that have been recently affected by an Ice Age, for example, northern Europe and North America. These kinds of lakes may be in glaciated valleys (see: Finger lake), or they may be in more low-lying regions. The Great Lakes of North America (Huron, Michigan, Superior, Ontario, Erie) are the world’s largest lakes formed by glaciation. Lakes are also found in places where the land has sunk due to the splitting of the Earth’s crust (for example, Lake Malawi in East Africa). Small lakes are also found in ancient volcanic cones. They are called crater lakes (for example, Crater Lake, Oregon).
 Irrigation—This picture shows center
pivot irrigation, where water is pumped from underground up a well and then used to irrigate a circular field through a large, rotating beam sprayer.
 Irrigation—This is what spray irrigation looks like from the ground.
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