Download The Gale encyclopedia of science vol 4 by K Lee Lerner; Brenda Wilmoth Lerner PDF

By K Lee Lerner; Brenda Wilmoth Lerner

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Maddocks Consulting Scientist DeSoto, Texas Lee Wilmoth Lerner Science Writer NASA Kennedy Space Center, Florida Scott Lewis Science Writer Chicago, Illinois Frank Lewotsky Aerospace Engineer (retired) Nipomo, California Karen Lewotsky Director of Water Programs Oregon Environmental Council Portland, Oregon Kristin Lewotsky Editor Laser Focus World Nashua, New Hamphire Stephen K. D. Ed. Wilmington, North Carolina David Lunney Research Scientist Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse Orsay, France GALE ENCYCLOPEDIA OF SCIENCE 3 Contributors Amy Kenyon-Campbell Ecology, Evolution and Organismal Biology Program University of Michigan Ann Arbor, Michigan Gail B.

Eutrophic—Older, fertile lakes with thick basin deposits and several life forms. Mesotrophic—Middle-aged lakes with intermediate levels of basin deposits and numbers of life forms. Oligotrophic—Young lakes with the least amount of basin detritus and numbers of life forms. Turnover—The mixing and flip-flopping of thermal layers within a lake that results in nutrient mixing within the lake. ing acid rain), eutrophication, and shoreline overdevelopment.

Deeper water is generally both denser and colder than shallower water—other than ice. In fall, the surface is cooled in proximity to the surrounding air. As this surface water cools, it sinks, mixing throughout the epilimnion. The epilimnion continues to cool and eventually matches the metalimnion in temperature. Wind mixes these two water layers, which then cool to temperatures lower than the hypolimnion temperature. Then the hypolimnion water mixes in with the rest of the water and rises to surface.

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