Keynote.river System.6.18

7/31/2019 Keynote.river System.6.18

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Surface watersLorena, BCMSG, Summer 2012

Thursday, June 21, 2012


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What is a river system?

Photo source: USGS Yukon River Basin Studies

http://ak.water.usgs.gov/yukon/index.phphttp://ak.water.usgs.gov/yukon/index.php


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What is a river system?

A system is a set of connected parts that work

together to become a whole.

A river and all the streams and smaller rivers

that flow into it together make up a riversystem.



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Define watershed

All the water in a river system drains into one

main river.

The land area that supplies the water to a river

system is called a watershed.

Watersheds are sometimes known as

drainage basins.



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Major watersheds#1. Columbia

River Watershed

#2. Colorado

River Watershed

#3. MissouriRiver Watershed

#4. Mississipi

River Watershed

#5. Ohio River

WatershedThursday, June 21, 2012


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New Yorks Watersheds

New York has 17

watersheds. Which one

do you think we belong

to?

http://www.dec.ny.gov/lands/60135.htmlhttp://www.dec.ny.gov/lands/60135.htmlhttp://www.dec.ny.gov/lands/60135.htmlhttp://www.dec.ny.gov/lands/60135.html


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Define divide

What keeps watersheds separate from one

another?

One watershed is separated from another

watershed by a ridge of land called a divide.

The Great Divide (also known as TheContinental Divide) is the longest divide in

North America.



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How do divides separate watersheds?

Divides arenatural barriers.

They keep water

from allwatersheds from

joining just one

large river.

Different rivers

empty into

different oceans.Thursday, June 21, 2012


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What are ponds & Lakes?

Photo Source: Lake George - www.visitlakegeorge.com

http://www.visitlakegeorge.com/http://www.visitlakegeorge.com/


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Pond demo questions

How are the plants different from algae?

How are the plants alike from algae?

How are plants and algae important parts of

their habitats?



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Where does pond & Lake water

come from?

Unlike streams and rivers, ponds and lakes

contain still water (water that doesnt flow).

Some ponds and lakes get their water from

rainfall, melting snow, and runoff. Some get

water from rivers or groundwater.

Ponds and lakes form when water collects in

hollows and low areas of lands.



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What Are ponds & Lakes?



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Venn Diagram

Ponds Lakes

Sample:Shallower,

sunlight

reaches thebottom

Sample:Contains

still

water

Sample:Deeper,

darker,

colder,

has largefish



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What are 3 types of lakes?

1) Glacier lakes - some lakes were formed in depressionscreated by ice sheets that melted.

2) Rift valley lakes - some lakes were created by movementsof the Earths crust that formed deep valleys.

3) Volcanic lakes - some lakes were formed by volcanoes.

Lava or mud can block rivers, and lakes can also form inem t volcano craters.



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How can lakes change?

Natural processes and human activities can cause

lakes to disappear.

As lake organisms die, bacteria break down the bodiesand release nutrients into the water.

Over time, nutrients can build up in the lake in a

proces called eutrophication.

Humans can cause eutrophication too. Fertilizer from

farms run off into ponds and lakes.

http://www.youtube.com/watch?v=UGqZsSuG7aohttp://www.youtube.com/watch?v=UGqZsSuG7aohttp://www.youtube.com/watch?v=UGqZsSuG7ao


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Sequence Diagram

Organisms releasewastes and nutrientsinto the water. Dead organisms pile

up in the bottom ofthe lake, making itshallower.

Over time, the lakebecomes filled in,forming a meadow.

Keynote.river System.6.18

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