Lake retention time is the average length of time that water or substances such as pollutants remain in a lake. Some lakes "flush" themselves in a matter of days: Precipitation, runoff and groundwater sources bring water in; evaporation and subterranean channels carry it out. Large lakes with minimal drainage have long retention times. For Lake George in New York State, retention time is eight to nine years. For Lake Superior, largest of the Great Lakes, it's more than 170 years. For Lake Tahoe, it's about 700 years.
Lake Baikal, the world's deepest lake, is in what country?
Previous answer: Bow Wow Wow hit the U.S. charts with "I Want Candy" in 1982.
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