D ISTRIBUTION OF W ATER ON E ARTH. THIRST VIDEO
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Transcript of D ISTRIBUTION OF W ATER ON E ARTH. THIRST VIDEO
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DISTRIBUTION OF WATER ON EARTH
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THIRST VIDEO http://www.slideshare.net/jbrenman/thirst
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THE HYDROSPHEREHydrosphere: the part of
Earth that contains water
97% of Earth’s water is salt water
Only 3% is fresh water: (30% groundwater, 68% frozen, 2% on surface)
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SALTWATER Oceans cover 71% of Earth’s surface (about
¾) Land takes up 29% of Earth’s surface (about
¼) 2 categories of water in the Hydrosphere…
based on Salinity = % salt content Saltwater:
97% of Earth’s waterOceans35 g salt/kg of water
How many oceans are currently recognized today??!!
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FRESHWATERFreshwater:
< 1 g salt/kg of waterONLY 3% of Earth’s water is fresh
2/3 of that is frozen in glaciers, ice caps, & icebergs (pieces of glaciers floating in ocean)
1/3 of that is liquid & accessible in lakes, ponds, rivers, streams, or underground
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FRESHWATER RESOURCES Most freshwater is
frozen at the polar ice caps!!
Glaciers are masses of ice and snow that move slowly over the Earth’s surface.
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WHERE’S THE WATER?
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The Great Lakes are the largest freshwaterSystem on earth. They contain 84% of North America’s surface freshwater and 21% of the world’s surface fresh watersupply. Only the polar ice caps containmore fresh water.
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FRESHWATER RESOURCES 1/3 of Earth’s freshwater is
groundwater!!
Groundwater forms when water moves through soils and sediment and collects in spaces underground.
An aquifer is a rock layer that stores water in the spaces between the rock and allows water to flow through it.
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AQUIFERS Underground permeable rock or
sediment that contains water Particles in ground act like filter to water!!
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GROUNDWATER Water that seeps into the soil & is pulled
down by gravity Can move or sit under the surface if there
are spaces between the rock/soil particles (permeable)
Water will seep down until it hits an impermeable surface, then fill up from there (like your bathtub with the drain closed!)
The region filled with ground water = Saturation Zone
The top surface of this area = Water Table
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A/C WATER TABLE & SATURATION ZONE
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GROUNDWATER TO THE SURFACE VIA… 1.) Man-made Well – pipe dug into
ground to extract water from aquifer 2.) Artesian Well – water flows
naturally to surface because it’s under pressure
3.) Spring – water flows to surface because surface of land dips below water table
4.) Hot Spring/Geyser – water heated up by rocks, pushes up to surface due to pressure
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MAN-MADE WELL
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ARTESIAN WELL & SPRING
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GEYSER IN ICELAND – YOUTUBE CLIP http://www.google.com/url?q=http://
www.youtube.com/watch%3Fv%3DW-daow-LojM&sa=U&ei=n65CT8aeApDcgge2o63lCw&ved=0CCgQtwIwAg&usg=AFQjCNEpLlDlSzVPx4aS-Tu3nfBc1pCkKw
http://www.youtube.com/watch?v=tShhZvvIM84&feature=related
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WATER CYCLE – QUICK REVIEW 1. Sun heats the water on the surface of Earth 2. Freshwater evaporates into atmosphere as
water vapor (salt in ocean stays behind) 3. Water vapor cools & condenses on dust
particles to form clouds 4. Water falls back to Earth as precipitation in
the form of rain, sleet, snow, or hail 5. Precipitation that hits surface either gets
absorbed into ground, stays trapped as standing water, or moves downhill as “run-off” back into lakes, ponds, rivers, streams, oceans
**The amount of water on Earth stays the same!!**