ACCORDING TO THE STUDENT PILOT, HE WAS SOARING OVER THE MOUNTAINS. HE STATED THAT HE WAS GAINING AND LOSING ABOUT 200 FEET OF ALTITUDE AS THE GLIDER SOARED OVER THE RIDGE FROM NORTH TO SOUTH; HOWEVER, ON THE LAST TRAVERSE THE GLIDER LOST LIFT AND HE WAS UNABLE TO CLEAR THE HIGH TERRAIN AND COLLIDED WITH TREES. THE PILOT REPORTED THAT THERE WAS NO MECHANICAL MALFUNCTION AND THE ACCIDENT COULD HAVE BEEN PREVENTED IF HE HAD MORE EXPERIENCE IN MOUNTAIN SOARING.