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Subterranean riverPonorFlowstoneCanyonCave-inAquiferKarst springSpeleologySubmarine canyonPlunge poolGullyIce caveRock-cut basinPit craterSolutional caveLava tubeSlot canyonHydrothermal mineral depositIntrusive rockTunnel valleyDebris flowGroundwaterSpeleothemLodeGroundwater rechargeGeological formationTinajaSumpCavingCenoteGiant's kettleBlue holeRockslideFissure ventLamprechtsofenSurface runoffIgneous intrusionPorphyry copper depositPhreaticRillSea caveCaves of the mendip hillsCave surveyNatural archFall lineCedar sinkGorgeRuby fallsFraser canyonQuarryGlacier caveGrottoPetroleum seepProglacial lakeMartian lava tubePhreatic zoneMontezuma wellSinkholeTurbiditeRock-cut tombSubmarine earthquakeLandslide damSubglacial lakeKatabatic windPotholeRavineFloodplainColluviumSwimming holeBlueschistHohlenstein-stadelCrevasse splayCouloirQuarry lakeRock-cut architectureRift lakeHierve el aguaRock shelterArtesian aquiferCold seepRusticleFlood basaltIce fieldSt. michael's caveHydrothermal ventSalt domeLava lakeHocking hillsMineral springMaarKettleSedimentary basinCave divingMonterey canyonGrand canyon cavernsPhyllic alterationRio grande gorgeCave pearlRock reliefAlluvial fan