A massive 650-foot mega-tsunami hit Greenland after a huge rockslide in a fjord, and it shook the Earth! This wasn’t your usual wave—it was caused by a big chunk of rock crashing into the water. The force sent a massive wall of water rushing through the fjord, swallowing everything in its path. It was so powerful that scientists recorded it as a major event. Thankfully, these types of tsunamis are rare, but when they happen, they can be devastating.