Chapter 4 – Earth’s Water

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Presentation transcript:

Chapter 4 – Earth’s Water Lesson 3 – Freshwater Resources © Brent Coley 2010 | www.mrcoley.com

Where is freshwater found? Much of Earth’s fresh water is frozen in sheets of ice or glaciers. Glacier: large sheet of ice that moves slowly across the ground

Where is freshwater found? We get our fresh water from three sources: Running water – rivers, streams Standing water – ponds, lakes, reservoirs (human-made lakes)

Where is freshwater found? Groundwater – water that is underground Aquifer: underground layer of rock or soil that holds water

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

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

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

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

Watershed image courtesy of Natural Resources Canada (www. nrcan. gc Watershed image courtesy of Natural Resources Canada (www.nrcan.gc.ca) and used with permission. All other images courtesy of Microsoft Office Online.