Missouri, Tornadoes and You!
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Tornado
Natural Disasters in Missouri
Tornadoes, and saftey
Mechanical Waves & Sound Waves
Longitudinal Waves & Tranverse Waves
other web site
http://earthsky.org/earth/why-does-the-sky-change-color-before-a-tornado
http://www2.cose.isu.edu/~hackmart/waves100.PDF