Basalt columns at Kálfshamarsvík, Skagi Peninsula, Iceland (© Arterra Picture Library/Alamy)

Do you think rocks are just … well, rocks? These natural mineral combinations have done more than just sit around—they've built the Earth's crust and helped humans shape history. From Stone Age tools to the minerals powering modern civilization, rocks have been essential throughout our journey. International Rock Day celebrates this enduring impact, inviting us to explore the science of rocks, admire their natural beauty, and recognize the rich variety they add to our world.