On Mount Lemmon, volunteers give unemployed rocks a new job: Erosion control

Julius Gorton pushes a rectangle-shaped rock into the ground then shakes it. Still loose. He takes the pick axe next to him and hammers it down. “OK, maybe it just needs to dig out a little bit,” Ella Marshall says. She moves the rock aside and starts digging a gap into the dirt, her hands protecte...

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