A tsunami on a truly global, continent-overwhelming scale would not happen from earthquakes, storms, or volcanic eruptions alone. Events like that would require an extraordinary, external force — such as a large planetary body colliding with Earth. Here’s the science behind it: • Earthquakes displace sections of the seafloor, but even the largest ones only move limited areas. The ocean simply can’t be pushed hard enough, over a wide enough region, to create a planet-spanning wave. • Underwater landslides and volcanoes can cause dangerous regional tsunamis, but their energy dissipates rapidly as waves spread. • Storm surges are driven by wind and pressure, not deep-water displacement, so they lack the vertical force needed for mega-tsunamis. To generate a wave capable of flooding multiple continents at once, you’d need: • Instant, massive ocean displacement • Energy far beyond Earth’s internal processes • A trigger large enough to affect the entire planet at the same moment A p...