Image: via Gyrzzl

Tsunamis, earthquakes and other violent natural disasters can all wreak havoc and cause untold destruction – sometimes at a great cost to humanity. Thankfully, there are usually warning signs before one of these catastrophic events hits – through animal behavior, perhaps, or changes to the environment. And it’s well worth knowing what you should be looking out for even when you’re simply exploring the natural world. After all, being aware of the true meaning of those square waves may just save your life.

Image: Tahreer Photography/Getty Images

40. A rapid fall in sea level can mean a tsunami is on the way

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If you’re at the ocean’s edge and you see the water retreating from the beach at a faster rate than usual, it’s time to make a move. Urgently head away from the shore, as the sea’s sudden outflow is very likely a signal that a tsunami is imminent – and your survival may well depend on how quickly you react.

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