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Essay / Research Paper Abstract
5 pages in length. Considered rare in relation to conventional lake formations, the natural creation of Crawford Lake occurred as the direct result of a deep crack found in the Niagara Escarpment. This fissure, cavernous enough to prevent any sunlight from reaching the bottom water and, thereby, rendering it extremely cold, keeps the top and bottom water layers separated to such an extent that they never mix, scientifically called meromictic. Bibliography lists 6 sources.
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5 pages (~225 words per page)
File: LM1_TLCCrawLake.rtf
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fissure, cavernous enough to prevent any sunlight from reaching the bottom water and, thereby, rendering it extremely cold, keeps the top and bottom water layers separated to such an extent
that they never mix, scientifically called meromictic (Hamilton Naturalists Club, 2003). What makes Crawford Lake unique to others in Ontario and even the rest of the world is the meromictic
factor. Crawford does share some of the same qualities of typical lake formation, such as having both a warmer upper (the epilimnion) and colder lower (the hypolimnion) layer, a
thermal stratification caused by the naturally occurring denseness of colder water forcing it downward. Summertime heat keeps the top layer considerably warmer than the bottom layer, furthering the separation
between the two temperatures. Crawford Lake, however, is not just cold; rather, its water is so frigid at the bottom of its very deep crevasse that this coldness is
separated even further into separate layers; this multilayer presence precludes any mixing in of warmer top layers and, therefore, maintains its coldness to a much greater degree than most other
lakes. Adding to this effect is the low oxygen levels found in such frigid water, making it very difficult for things to decompose; as such, anything thrown into Crawford
Lake that has sunk to the bottom will likely remain intact in its original form for years and years in a sort of mummified state (Hamilton Naturalists Club, 2003). The
meromictic property of twenty-four meters deep Crawford Lake also addresses the preservation factor of its annual sediment deposit. These varves, the scientific name for the ring-like sediment formation, provide
researchers with the ability to actually date the lakes historical progress much the same as trees are dated by their trunk rings. In fact, the double-layered sediment circles that
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