A tsunami is an unusually large ocean wave, which is sometimes formed by earthquakes. The height of a tsunami increases as it approaches shore. In the open ocean, tsunamis can travel at 300 to 400 miles per hour.
Based on this information, which statement must be true?
A . Tsunamis have killed millions of people in this century.
B . The height of a tsunami located 100 miles offshore is low.
C . Tsunamis are sometimes found in small lakes.
D . Tsunamis travel at 100 miles per hour.
E . There are no known causes of tsunamis.
Answer: B
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