6th grade-River system- also Lakes and Ponds.pptx

8/11/2019 6th grade-River system- also Lakes and Ponds.pptx

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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

Documents

6th grade-River system- also Lakes and Ponds.pptx