Earth Day is a chance to learn Benjie Sanders Arizona Daily Star Apr 25, 2013 Rex Adams, a retired research specialist with the UA Tree Ring Lab, explains tree cross-sections to Pima Community College Northwest students Ylana Heinritz and Wesley Phillips at the event. PHOTOS BY BENJIE SANDERS / ARIZONA DAILY STAR Earth Day exhibitors included space groups, environmental programs, geology and hydrology displays, and more. Benjie Sanders/Arizona Daily Sta Skip Moen cooks a batch of chocolate chip cookies in his solar oven at PCC Northwest. Benjie Sanders/Arizona Daily Sta The Tucson Gem & Mineral Society booth included a variety of mineral and gem displays. Benjie Sanders/Arizona Daily Sta Tags Pima Community College Earth Day Recommended More LATEST LOCAL OFFERS 24 Hour Heating and Cooling, LLC Keep your AC running smoothly this summer! Call 24 Hour Heating and Cooling, LLC today! Arizona Pistachio Nursery Great Red Push Pistache trees for your landscape! See the selection at Arizona Pistachio Nursery today! 520-742-2241 KU Studios Home of Kids Unlimited There's Always Something Happening @ KU Studios. Now Accepting New Students. Click Here for More Information.