Rocks weren't "discovered" in the sense of a single event or location. Humans have always interacted with rocks – they've been an essential part of our environment since the beginning of human existence.

Here's a breakdown of how rocks have always been a part of our history:

* Early Humans: Our earliest ancestors used rocks for tools, shelter, and even art. Think of the first hand axes and the use of rock shelters for protection.

* Ancient Civilizations: Rocks were fundamental in building structures, creating sculptures, and developing tools and weapons. Think of the pyramids of Egypt, Stonehenge, and ancient Roman roads.

* Scientific Study: While people have always interacted with rocks, the scientific study of rocks, known as geology, developed much later, around the 18th century.

So, while there wasn't a specific "discovery" of rocks, our understanding and use of them have evolved significantly throughout history.