Tsunamis are giant, powerful waves most often caused by earthquakes beneath the ocean floor. Their incredible power can destroy entire communities, then drag the debris out to sea. This video shows what causes tsunamis and the importance of evacuating any area under a tsunami alert. ➡ Subscribe: ➡ Get More 101 Videos: About National Geographic’s 101 Series: Explore and experience the forces that shape the world around us. Get More National Geographic:
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