Metal Detector and Rocks.

Metal detectors are a great tool for the beach, I want a metal detector for finding rocks. Rocks are very fasinating things about the Earth they tell us a lot, like how old the planet is. I found a metal detector on craigs list for a 150 dollers. When, or if I get a metal detector I will take it to the beach.
At the beach I would try to find lost jewerly or money. I think it would be a fun sport.