Female Geologist examining Marcellus shale, near Marcellus New York, Source of natural gas and subject of fracking controversy


Marcellus shale, near Marcellus, New York, source rock of huge quantities of natural gas and subject of the "fracking" controvercy, showing natural fracturing, exposed weathered surface


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Photo credit: © John Cancalosi / Alamy / Afripics
License: Licensed
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