lake – a depression in the earth’s surface that collects and holds water can collect water from:...
TRANSCRIPT
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Lakes & Freshwater Wetlands
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Lake – a depression in the Earth’s surface that collects and holds water
Can collect water from:- Streams and runoff that flows into them
- Local precipitation, springs, and other sources
Most lakes have outlets from which water flows out to rivers and streams
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Origins of LakesForm naturally in surface depressions and low areas
Can form from landslides that block a stream
Can form from sinkhole that leaves a lake
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Sinkhole lakes
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Glaciers can form lakes when moraines block meltwater or water collects in cirques or other depressions left behind
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Glacier lakes
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Lake DevelopmentPlant’s add oxygen and wastes to lake water
Animals use the oxygen and add waste products
Decay of waste uses additional oxygen
Amount of oxygen determines a lake’s ability to support life
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As nutrients change, lake organisms change
Run off of fertilizers and animal wastes can cause a rapid growth of algae
Overpopulation can use up the oxygen supply
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WetlandsWetland – a land area that is covered with water for a large part of the year
Serve as a filtering system that improves water quality
Include bogs, marshes, and swamps
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BogsReceive water from precipitation, not stream-fed
Rich in peat mossWater-logged, acidic soil supports unusual plants (pitcher plants and Venus’ flytrap)
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Bog
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Freshwater MarshesForm along the mouths of streams and in delta areas
Large deposits of silt and mudContains grasses, reeds, and abundant wildlife
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Marsh
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SwampsDevelop from marshes that have filled-in enough to support shrubs and trees
The shade kills marsh plants
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Swamp