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A. To stay safe, people are advised to move

B. when a tsunami is approaching

C. a series of large ocean waves

D. Tsunamis can cause severe destruction

A tsunami is (37)_____ caused by underwater earthquakes, volcanic eruptions, or landslides. These waves can travel at high speeds across the ocean and grow taller as they approach shallow coastal areas. (38)_____ to buildings, roads, and communities near the shore.

Countries at risk of tsunamis, such as Japan and Indonesia, have established warning systems to alert people (39)_____. These systems use sensors to detect underwater earthquakes and send warnings through sirens, phones, and broadcasts. (40)_____ to higher ground as quickly as possible when they receive a tsunami warning.
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