Limestone. It's basically the snack of the Earth. Just don't eat it, because my hoomans say it doesn't taste too good. It's because it's made from ancient sea critters, like shells and coral, that got smooshed together over millions of years. Imagine a giant cosmic belly flop of clams and fish bones. Real crunchy and not real tasty! And guess what? Limestone fizzles when you pour vinegar on it. It's like soda pop for rocks! Also, the hoomans use it for buildings, roads, and e