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A tidal wave is a term often used incorrectly to describe a tsunami. True tidal waves are caused by gravitational forces of the moon and sun, creating regular rising and falling of sea levels. Tsunamis, on the other hand, are caused by underwater earthquakes, volcanic eruptions, or landslides. They can travel across oceans at speeds up to 800 km/h and grow to heights over 30 meters when reaching shallow waters. Warning systems and evacuation drills save lives in vulnerable coastal regions. tidal wave vietsub