6th grade-river system- also lakes and ponds.pptx
TRANSCRIPT
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CCCS
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How does fresh water flow on Earth?
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Where
s Water?
-Surface Water
Rivers, Lakes, and Ponds
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River Systems
The streams and smaller rivers that feed intoa main river are called tributariesTributaries flow downward toward the mainriver, pulled by the force of gravityA river and all its tributaries together makeup a river system
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River Features
HeadwatersTributaries
Flood plainOxbow lakeMeander
MouthDeltaEstuary
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River FeaturesThe many small streams that come together
at the source (beginning) of a river arecalled its headwatersThe steep slope of the land causes the river
to flow quickly
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Headwater
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HorseshoeBend
of the Colorado River
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Ox Bow lake on Mississippi
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River Features
The broad, flat valley through which a riverflows is its flood plain
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River FeaturesThe mouth of a river is where the riverflows into another body of waterA delta is created when the river slowsdown and deposits the sediment it wascarrying
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Delta Formation
DEPOSITON OF MATERIAL BY THE RIVERWHEN IT ENTERS THE SEA
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Mississippi Delta from Space
MISSISSIPPI
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aters e sThe land area that supplies water to a riversystem is called a watershed Watersheds are sometimes known asdrainage basinsMontclair is in the Hackensack-PassaicWatershed
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Divides
A ridge of land that separates one watershedfrom another is called a divide
Mountains are an example of a divide
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Divides
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Estuaries
An estuary is acoastal inlet or
bay where freshwater from riversmix with salty
ocean water
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Surface Water Part II:
Ponds and Lakes
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Ponds
Ponds arefreshwaterPonds are shallowPonds form whenwater collects inlow-lying areas oflandPlants grow at the
bottom of ponds
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Lakes
Lakes arefreshwaterLakes are deepLakes form whenwater collects inlow-lying areas of
landPlants do not growat the bottom of
deep lakes
Lake Baikal, Russia
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Volcanic Lake
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Glacier-Made Lakes
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Human-Made Lakes
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Lakes Can Change
Seasonal changes- watertemperature at different depthschanges during the yearLake turnover-nutrients mix
Nutrients -substances such asnitrogen and phosphorus that plants and algae grow
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Lakes Can Change
Long-term changes
Eutrophication -Algae and scumforms on the surface of the waterbecomes so thick that it blocks outsunlight and plants cannot carry outphotosynthesisDeath of a body of fresh water
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Eutrophication
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Eutrophication
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Crater Lake and Lake Nyos Links
http://en.wikipedia.org/wiki/Crater_lake http://news.bbc.co.uk/onthisday/hi/dates/stories/august/21/newsid_3380000/3380803.stm
http://en.wikipedia.org/wiki/Crater_lakehttp://news.bbc.co.uk/onthisday/hi/dates/stories/august/21/newsid_3380000/3380803.stmhttp://news.bbc.co.uk/onthisday/hi/dates/stories/august/21/newsid_3380000/3380803.stmhttp://news.bbc.co.uk/onthisday/hi/dates/stories/august/21/newsid_3380000/3380803.stmhttp://news.bbc.co.uk/onthisday/hi/dates/stories/august/21/newsid_3380000/3380803.stmhttp://news.bbc.co.uk/onthisday/hi/dates/stories/august/21/newsid_3380000/3380803.stmhttp://news.bbc.co.uk/onthisday/hi/dates/stories/august/21/newsid_3380000/3380803.stmhttp://en.wikipedia.org/wiki/Crater_lake