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Unique properties of water
1.) Strong hydrogen bonding
2.) Temperature of water changes slowly due to its high specific heat
3.) Water has a high boiling point
4.) A lot of energy is needed to evaporate water
5.) It dissolves many compounds
6.) Water filters out harmful UV radiation in aquatic ecosystems
7.) Water expends when it freezes
Formation of Lakes
1.) tectonic uplift of a mountain range that creates a depression that accumulates water
2.) advance and retreat of glaciers that scrape depressions in the Earth's surface where water accumulates
3.) salt or saline lakes that form where there is no natural outlet or where the water evaporates rapidly and the drainage surface of the water table has a higher-than-normal salt content
4.) oxbow lakes formed by erosion in river valleys
5.) crater lakes formed in volcanic craters and calderas that fill up with water more rapidly than they empty
Level of lakes
controlled by the difference between the input and output compared to the total volume of the lake;significant input sources are precipitation onto the lake, run off carried by streams and channels from the lake's catchment area, groundwater channels, and artificial sources from outside the catchment area
Deep-water Benthic zone
bottom of an aquatic ecosystem; consists of sand and sediment and supports its own community of organisms
Lakes which are oxygen-poor and nutrient-rich, and have high amounts of organic matter, algal blooms
excessively enriched with nutrients; algal blooms; result of human activity such as fertilizers
the surface and water near the shore are warmed by the sun making them less dense so they form this
Seasonal turnover (lake water)
the exchange of surface and bottom water in a lake or pond that happens twice a year,
During the summer, the sun heats water near the surface of lakes (which results in a well-defined warm layer of water occurring over a cooler one--stratification); as the summer continues, temperature differences between the top and bottom layers increase and a think middle layer (thermocline) develops where the rapid transition in temperature occurs; with arrival of fall and cooler air temp, water at the surface cools and becomes heavier; strong fall winds move the surface around which promotes mixing with deeper water
As the winter approaches in areas where subfreezing temperatures are common, the lake surface temperatures approach the freezing mark; lake waters move toward freezing, water sinks to the lake bottom when it reaches 4 degrees Celsius, colder water remains above (maybe becoming ice), when the surface ice begins to melt the cold surface water warms until the temp of the bottom waters produce a fairly uniform temp distribution throughout the lake, winds blowing over the lake again set up a full circulation system
swamps, estuaries, marshes, and bogs; wetlands are characterized by a water table that stands at or near the land surface for long enough season each year to support aquatic plants
plant and animal life near wetlands
mangrove, water lilies, cattails, sedges, tamarack, black spruce, and cypress/many different amphibians, reptiles, birds, and mammals
Ramsar Convention (1971)
International treaty designed to address global concerns regarding wetland loss and degradation
a geologic formation that contains water in quantities sufficient to support a well or spring
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