Ever climb a mountain? Guess what—you might have been standing on an ancient ocean floor. Limestone, the stuff that makes up huge peaks like the Himalayas, is literally squished seashells and coral from millions of years ago. That’s right: dead sea creatures got squashed into rock taller than clouds.
And the highest point on Earth, Mount Everest? It’s still growing by about a quarter-inch every year. Talk about a growth spurt.
