Go See It. Here in Arkansas we have many places to visit where you can learn how the world is put together. The Ark. Geological Commission Learning Center in Little Rock is open by appointment. Dens can make a trip to dig crystals, leaders can invite a member of one of the local clubs to come over and give a talk to your meeting and show and tell about rocks, or ask a local high school earth science teacher to come share a rock collection. Alternatively, local museums will have displays you can visit - thus earning a field trip toward your National Den Award status.
Some museums have films about dinosaurs and volcanoes.
Call your local museums and state parks to see what facilities and resources they have. These activities will earn the scout points toward a gold or silver arrow. Not all parts of the country have minerals that are easy to collect, but you should be able to find different rock types. Identifying those rock types might require some help. Ask the high school science teachers, local rock club members, and community college instructors to help you.