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THE CORRECT ANSWER: A tsunami

Tsunamis are series of giant waves of phenomenal power that propagate at high speed across the world's oceans. They are mainly triggered by underwater earthquakes which suddenly displace immense volumes of water following the rupture of tectonic faults.These waves can also be caused by coastal landslides or underwater volcanic eruptions. In the open sea, these waves remain almost invisible and very low. It is when approaching the coast that the decrease in depth slows down the wave, which accumulates energy and creates a wall of water that can exceed thirty meters in height.The historic tsunami of December 2004 in the Indian Ocean tragically illustrated the vulnerability of populations to this phenomenon of incredible violence, affecting many Asian countries and causing heavy human tolls that are difficult to forget.