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Tsunamis are ocean waves generally produced when earthquakes suddenly displace the ocean floor, and with it a huge volume of water. Unlike ordinary waves on the ocean surface, a tsunami involves the entire water column, from surface to bottom. To a tsunami, the ocean is shallow—and that makes tsunamis shallow-water waves, whose speed is
FIGURE 14.39 People flee as the devastating tsunami of December 2004 strikes Thailand (Passage Problems 81-84).
A tsunami is traveling at 450 km/h when the ocean depth abruptly doubles. Its new speed is roughly
- a. 225 km/h.
- b. 320 km/h.
- c. 640 km/h.
- d. 900 km/h.
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