To you, national parks may be full of rocks. To geologists, it is like Disney World. Geologists study rocks. They could spend days or weeks at each park trying to solve the mystery of how the rocks were formed or moved.
To visit these parks from your computer, please go to: http://3dparks.wr.usgs.gov/
To learn more about geology, you can visit: http://www.sciencekids.co.nz/geology.html