Plentiful and plain shale plays vital role on Earth
1 of 1
This outcropping of the Marcellus formation near Williamsport, Pa., shows shale that could be rich in natural gas.
Photos: Make-A-Wish Hawaii's Jingle Rock Run, Dec. 21
Photos: H.S. Basketball: Oak Hill vs. Bishop O'Dowd, Dec. 20
Photos: H.S. Basketball: Punahou vs. McKinley, Dec. 20
More Photo Galleries »