Enjoy a slideshow presentation on Crater Lake National Park and Yellowstone National Park. See how earthquakes and volcanoes played a part in their formation. View Crater Lake’s magnificent blue water and Yellowstone’s geysers, hot springs, pools, and its abundant wildlife. This slideshow will be presented by John Mingori, a traveler to many of the national parks, former teacher and librarian on October 7 at 6:30pm at the Ossipee Public Library.