Most waves are very small, but every once in a while, they can be really extreme! Hi there! We at SciShow want to learn more about you and your opinions! If you have time, please take a moment to fill out this survey: https://www.surveymonkey.com/r/SciShowSurvey2017 Thank you! ---------- Love SciShow Kids and want to help support it? Become a patron on Patreon: https://www.patreon.com/scishowkids ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow SOURCES: https://news.nationalgeographic.com/news/2004/12/1228_041228_tsunami_2.html http://www.tsunami.noaa.gov/ https://nctr.pmel.noaa.gov/faq_display.php?kw=15%20March%202005%20Interview%20with%20Dr.%20Hal%20Mofjeld http://www.srh.noaa.gov/jetstream/tsunami/tsunami_faq.html