Most waves are very small, but every once in a while, they can be really extreme!
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SOURCES:
news.nationalgeographic.com/news/2004/12/1228_041228_tsunami_2.html
nctr.pmel.noaa.gov/faq_display.php?kw=15%20March%202005%20Interview%20with%20Dr.%20Hal%20Mofjeld