Limestone

Hello. Can you guess what I am. I’m not a plant or an animal, but I’m made of millions of them. A very, very long time ago, tiny sea creatures with beautiful shells lived in the ocean. When they finished their lives, their shells and skeletons drifted down to the sea floor. Over millions of years, they piled up and got squished together by the water's weight, turning into me. I am a soft, grayish-white rock, and you can find me all over the world, holding the stories of ancient oceans. I am Limestone.

For thousands of years, people have seen how special I am. Because I'm a softer rock, I'm easy to cut into big, useful blocks. The ancient Egyptians figured this out a long, long time ago. Around the year 2560 BCE, they used me to build their giant, pointy pyramids. The Great Pyramid of Giza was covered in shiny, white pieces of me, so it would gleam under the hot sun. Later, the clever ancient Romans found a new trick. Around the 3rd century BCE, they learned that if you heat me up, I change into a powder. When they mixed that powder with water and sand, it turned into a super-strong glue called cement. They used it to build amazing things like bridges and buildings that are still standing today.

Today, I’m still helping in ways you might not expect. Have you ever drawn with chalk on a sidewalk. That’s me. A little bit of me is even in some kinds of toothpaste to help make your teeth strong and clean. Farmers spread me on their fields to help their plants grow healthy and strong. And of course, I am still the main ingredient for the cement that builds your schools, homes, and tall skyscrapers. I may look like a simple rock, but I am made of ancient life. I am a piece of history that helps you build a strong and wonderful future, one block at a time.