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What's so cool about rocks? Each rock has a story to tell.
Each rock has a story to tell.
   
Chuck Said
I don't know if there's anything particularly cool about rocks themselves. What's cool are the things that rocks can tell you when you look closely at them. Rocks can tell you something about the history of an area, like how a mountain became a mountain.

Rocks can also help answer larger questions about the Earth's history, such as how it has changed over time. The Earth is sort of like your body. It has all kinds of different parts that work together and affect each other. We call this a system. The Earth system is always changing, and the interaction between all of its parts is very complicated. Rocks can tell us how the different parts of the Earth work. That's what makes rocks so cool.