Two skiers and a snowboarder pause briefly in the snow at Mammoth Mountain. This season, the resort received a record breaking amount of snowfall that has kept many of its trails open into the summer months. (Mammoth Mountain Ski Area) Although many people typically flock to beaches and lakes to cool off and relax on July Fourth, some skiers and snowboarders are celebrating the summer holiday on the snowy ski slopes of Californian's Mammoth Mountain. The ski area, located in the Sierra Nevada, r