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cavity hole hollow pit concavity crater dent gap pouch aperture cutting lacuna orifice chamber depression dint indentation indenture pocket recess socket space basin caries cleft crack fissure geode nook opening vacuity void dip trough excavation chasm pothole gulf cave abyss breach cavern split dimple rift shaft trench hiatus well cranny interstice scoop break vacuum ditch rent tunnel dugout impression groove crevice chink channel empty space bowl borehole emptiness slit blank slot tube vent cut fracture vacancy blankness sinkhole separation interval den notch grotto niche perforation pockmark nothingness rut gash hollowness mouth grot delve antre furrow gouge discontinuity subterrane rupture underground chamber valley sag waste burrow sinkage sink passage mineshaft fossa indent canyon ravine gorge chute pan score incision flaw window gallery outlet crevasse foramen check spout black hole blank space subterranean area rock shelter bore-hole pore chuckhole tomb grave scratch cup dish openness divide nick scrape bergschrund mark alcove fault compartment sack receptacle barrenness inanity desolation exhaustion vacuousness destitution inanition large cave curve bottom nullity precipice bore lack chip oblivion division grike scission track bag nihility want interspace mine giant kettle caldera vaccum depletedness desertedness breadth voidness punchbowl cleavage dig quarry vale deadend impasse solfatara maar ding headway amplitude pause compass diggings dust bowl gutter rime rima parting interruption crenel scallop con-cavity embrasure cave in open space archaeological site duct runnel wheel track rabbet flue shell hole pipe chimney wheel mark tear column drain cul-de-sac airway eye puncture spyhole loophole passageway peephole judas scuttle airduct exhaust air shaft air passage free space gully shelter lair canal lodge dike house seam fluting crease corrugation foxhole divot fosse nest warren gulch sett foss sheugh conduit watercourse moat swallet shakehole swallow hole kettle hole kink antrum bed bunker cellar irregularity sinus flume line culvert retreat earth lie covert set fold rivel undulation ridge plica crow's-foot rimple ruck haunt waterway entrenchment earthwork defile clove couch hovel hideaway rebate resting place flute drey main arroyo sap drill hideout pucker crimp abysm deep ocean depth bottomless pit bottomless depth

vugs vulcanicities vulcanicity vulcanised vulcanism Vulcanism VTs VT VSV VSIV V signs V sign