Oregon Public Broadcasting, Oregon Public Broadcasting
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This broadcast transcript offers an in-depth tutorial on the Missoula Floods. Between 13 and 15 thousand years ago, a huge lake (glacial Lake Missoula) created by a dam of glacial ice covered a large area of what is now western Montana. When the water cut underneath the glacial wall and the dam of ice collapsed, floods over 400 feet deep and traveling at over 90 miles per hour raced from Montana to the Pacific Ocean. The floods destroyed everything in their path, moved mountains, transported the rich soil of Eastern Washington to the Willamette Valley, and left behind gigantic channels, cataracts, and ripple marks. These features form the landscape that is now known as the Channeled Scablands. Links to a glossary are embedded in the text, and a list of related websites is also provided.
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Subject: Geoscience:Hydrology Grade Level: High School (9-12), Middle (6-8), College Lower (13-14) Topics: Hydrosphere/Cryosphere Theme: Teach the Earth:Course Topics:Hydrology/Hydrogeology, Teach the Earth:Teaching Topics:Water