Chapter 4 – Chapter 4 – Earth’s WaterEarth’s Water

Lesson 3 –Lesson 3 –Freshwater Freshwater ResourcesResources

© Brent Coley 2010 | www.mrcoley.com© Brent Coley 2010 | www.mrcoley.com

Where is freshwater Where is freshwater found?found?• Much of Earth’s fresh water Much of Earth’s fresh water isis frozen in sheets of ice or frozen in sheets of ice or glaciers. glaciers.• GlacierGlacier: large sheet of ice : large sheet of ice thatthat moves slowly across the moves slowly across the groundground

Where is freshwater Where is freshwater found?found?• We get our fresh water fromWe get our fresh water from three sources: three sources:

1.1. Running water – rivers, Running water – rivers, streamsstreams

2.2. Standing water – ponds, Standing water – ponds, lakes, lakes, reservoirsreservoirs (human- (human-made lakes)made lakes)

Where is freshwater Where is freshwater found?found?3.3. Groundwater – water that Groundwater – water that

isisundergroundunderground• AquiferAquifer: underground : underground layerlayer of rock or soil that holds of rock or soil that holds

water water

What is a watershed?What is a watershed?• WatershedWatershed: the area of land: the area of land where water that hasn’t where water that hasn’t evaporated evaporated or seeped or seeped into the into the ground ground drains into drains into a river a river

What is a watershed?What is a watershed?• Plants and roots help control Plants and roots help control thethe flow of water in a watershed. flow of water in a watershed.• When plants are removed, When plants are removed, waterwater can flow more quickly and can flow more quickly and carrycarry away soil. away soil.• FloodFlood: when water: when water overflows from a overflows from a body of water body of water onto land onto land

How is water polluted?How is water polluted?• Water can be polluted by:Water can be polluted by:• chemicals used to grow chemicals used to grow cropscrops and kill insects and kill insects• waste products from farms waste products from farms and factories and factories• spilled motor oils and trashspilled motor oils and trash

How is water cleaned?How is water cleaned?• Water is cleaned in waterWater is cleaned in water treatment plants. treatment plants.

Watershed image courtesy of Watershed image courtesy of Natural Resources CanadaNatural Resources Canada

(www.nrcan.gc.ca) and used (www.nrcan.gc.ca) and used with permission. All other with permission. All other

images courtesy of Microsoft images courtesy of Microsoft Office Online.Office Online.