Image Credit Source: No author given in the immediate parent document [1] / Thomas Knapp Submitted By:Thomas Knapp Added On: 05/03/2020 at 9:21 PM EDT Image Caption: SpentShale. Owner Name / Source: (From Wikimedia) No author given in the immediate parent document [1] / URL of Owners Page:https://commons.wikimedia.org/wiki/File:SpentShale.jpg Image Source: WikimediaPhotos License:Public domain Notes: From WikimediaPhotos CommonsSearch 'shale oil' Search