Introduction
In this chapter you have studied the physical geography of East Asia and have learned that many Pacific countries are vulnerable to coastal destruction and loss of life because of tsunamis. These gigantic sea waves are hard to detect. They travel silently beneath the sea surface very fast for hundreds and even thousands of miles until they reach land. Then, they suddenly unleash their great force. In this activity, you will learn about tsunamis in more detail, including why they occur, what their effects are, and where they occur. You will also learn what steps people are taking to defend against tsunamis.

Destination Title: Waves of Destruction: Tsunamis

Directions
Start at the PBS Online feature on tsunamis.

• Scroll down the page, taking notes as you read.
• At the bottom of the page, click on the link Sidebar One: Catching a Tsunami in the Act. Read this article. You may also want to click on and read Sidebar Two: Remembrance of Waves Past.