Tsunami is a Japanese word represented by two characters: "tsu" and "nami." The character "tsu" means harbor, and the character "nami" means wave. In the past, tsunamis were often referred to as "tidal waves." The term "tidal wave" is a misnomer. Tides are the result of gravitational influences of the moon, sun, and planets. Tsunamis are not caused by the tides and are unrelated to the tides.
from the National Tsunami Hazard Mitigation Program.

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Biggest Tsunami Countdown
[ Teens/Mature Teens ] A countdown of the five biggest tsunami events in recorded history.
Pacific Tsunami Museum
[ Teens/Mature Teens ] Promotes public education about tsunamis for the people of Hawaii and the Pacific Region. Includes answers to commonly asked questions and tsunami photographs.
Savage Earth: Waves of Destruction
[ Teens/Mature Teens ] Highlights include animated illustrations, articles, an "Ask the Experts" section, photographs, and video downloads.
Surviving A Tsunami—Lessons from Chile, Hawaii, and Japan
[ Teens/Mature Teens ] Booklet about how to survive a tsunami that includes stories of people who survived tsunamis in Chile, Hawaii, and Japan.
Tsunami Education
[ Mature Teens ] Learn the story behind tsunamis, and how to respond to a tsunami warning.
Tsunami Trivia
[ Kids ] Find the right picture to answer these questions, and do a word search. [PDF]
Tsunami WebQuest 2004
[ Kids/Teens/Mature Teens ] Provides detailed instructions and resources for a student team project on the causes and consequences of the Asian tsunamis.
[ Kids/Teens/Mature Teens ] Answers many questions about the topic. What does tsunami mean? How are they created? What happens to a tsunami as it approaches land?
Tsunami: The Great Wave
[ Kids/Teens/Mature Teens ] Discusses what tsunamis are, what causes them, and how warning systems can help save lives.
University of Southern California Tsunami Research Group
[ Teens/Mature Teens ] Shows where tsunamis have struck in the past and what they have done.
Wave That Shook the World
[ Teens/Mature Teens ] Answers questions about the Indian Ocean tsunami and also describes how these huge waves are formed and where they have happened in the past.
West Coast and Alaska Tsunami Warning Center
[ Kids/Teens/Mature Teens ] Features safety brochures and statistics about tsunami and earthquakes. Can be downloaded as PDF documents for printing.
Wikipedia - 2004 Indian Ocean Earthquake
[ Kids/Teens/Mature Teens ] Country by country reports of damage, historical and regional comparisons. Includes technical information on the quake and plate tectonics.

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