Related by context. Frequent words. (Click for all words.) 59 longwall mining 57 limestone bedrock 57 Mountaintop removal mining 56 seafloor methane 55 cambium layer 53 KINSHASA Congo Fabulous 53 heavily timbered 53 Mountaintop removal 53 blowdowns 52 scoria 52 situ leach 52 iron carbonate 52 By Riva Froymovich 52 highwall 52 Directional drilling 51 longwall mine 51 Horizontal drilling 51 coalbeds 51 Snake River Plain 51 lateritic 51 dolerite 51 coal seams 51 Coal gasification 51 shallow depressions 51 By Tona Kunz 51 Drip irrigation 51 By Brad Kadrich 50 joist girders 50 pneumatic drills 50 By DANIE HARRELSON 50 revegetating 50 mineralized quartz vein 50 leaks resembled geyser 50 peat soils 50 granitoids 50 acid leaching 50 By Katy Burne 50 limestone boulders 50 desiccating 50 By Laurelle Gilbert 50 Pu'u O'o crater 50 compacted soils 50 deciduous forests 50 sparsely vegetated 50 By Greg Swatek 50 alluvium 50 halite 50 Calcium carbonate 50 By Amy Boerema 49 By BEVERLY CORBELL 49 Click GIF file 49 situ leaching 49 fieldstones 49 molten rocks 49 culm 49 Uprooted trees 49 By SUE LOWE 49 bitumen extraction 49 mineshafts 49 By RICK KRETZSCHMAR 49 cyanide heap leach 49 Tree trunks 49 By TERESA RESSEL 49 mountaintop removal mines 49 longwall 49 yellow poplar 49 Coppabella 49 vertical shafts 49 longwall mining machine 49 lime plaster 49 hematitic 49 Bottom trawling 49 By Laurie Kulikowski 49 hydrofracturing 49 abrading 49 quartz stockworks 49 opencast mining 48 ferruginous 48 naturally occurring mineral 48 CDMHY 48 lava flowed 48 anhydrite 48 By Julian Pecquet 48 fencerows 48 sooty mold 48 alluvial deposits 48 By Vince Masiello 48 By TheStreet Wire 48 BY BEN POPKEN 48 sulfide bearing 48 compacted clay 48 mining 48 deep gorges 48 BY KATHERINE YUNG 48 Portovelo 48 bitumen tar 48 By Ben Geman 48 coalmining 48 loess 48 By TIMOTHY MANGAN 48 porous limestone