* What is a rock? There's no single, universally agreed-upon definition of "rock". Some people might include pebbles, while others might only consider large boulders.
* Variety of sizes: Rocks come in all shapes and sizes, from tiny grains of sand to massive mountain formations.
* Constant change: Rocks are constantly being formed, eroded, and broken down, so the number is always changing.
Instead of trying to count rocks, we can consider the vastness of Earth's geology! Think about the mountains, the beaches, the deserts, and all the other landscapes covered in rocks. It's truly a staggering number.
