PRESS PHOTOs BY C. RICHARD CHARTRANDApproximately 170 students from schools in Lehigh County, including students from Emmaus and Allentown Central Catholic high schools and Eyer, Lower Macungie and Seven Generations middle schools participate in the annual Lehigh County Conservation District's annual Envirothon recently at the Pool Wildlife Sanctuary, Emmaus. ABOVE: Murphy Pan, a student at Emmaus