A tsunami has hit Tonga's largest island, Tongatapu, after an underwater volcano in the South Pacific erupted. | CNN

A tsunami is a series of powerful ocean waves caused by sudden displacement of water, most commonly from undersea earthquakes, volcanic eruptions, or landslides. Unlike normal waves, tsunamis move at jet-like speeds in deep water and grow dramatically in height as they reach shallow coastlines, releasing immense energy over wide areas. Understanding how they form helps improve early warning systems and saves lives. #tsunamiscience #earthsystems #oceanphysics #naturalhazards #geoscience This vide