Crevasse

Crevasses often have vertical or near-vertical walls, which can then melt and create seracs, arches, and other ice formations.Water-filled crevasses may reach the bottom of glaciers or ice sheets and provide a direct hydrologic connection between the surface,[3] where significant summer melting occurs, and the bed of the glacier, where additional water may moisten and lubricate the bed and accelerate ice flow.[4][5] Direct drains of water from the top of a glacier, known as moulins, can also contribute the lubrication and acceleration of ice flow.[7] Some glacial crevasses (such as on the Khumbu Icefall at Mount Everest) can be 50 metres (160 ft) deep, which can cause fatal injuries upon falling.Occasionally a snow bridge over an old crevasse may begin to sag, providing some landscape relief, but this cannot be relied upon.
Transverse crevasses, Chugach State Park , Alaska
A crevasse in Tangra Mountains , Antarctica
A man crosses a crevasse in Easton Glacier , Mount Baker , in the North Cascades , Washington
The glacier Taschachferner below the Wildspitze (left, 3.768 m) in Tyrolia in Austria in April 2005. There are some zones with large open crevasses, e.g., the spot-shaped area below the middle of the image and most right. The line marks the ascent track of mountaineers on skis which intentionally avoided these dangerous areas.
Crevicelevee breachChugach State Parkglaciershear stressTangra Mountainsseracsarchesice formationsstratigraphyice sheetsmoulinsEaston GlacierMount BakerNorth CascadesWashingtontensile stressWildspitzeAustriamountaineers on skisKhumbu IcefallMount EverestHypothermiasnow bridgerope teamfriction knotsBergschrundBowie Crevasse FieldGlaciologyCrevasse rescuePolar GeographyBibcodeScienceGlaciersAufeisCirqueGlacieretIce capIce fieldIce sheetIce shelfIce streamLedoyomOutlet glacierPiedmont glacierRock glacierValley glacierAblation zoneAccumulation zoneBlue iceDirt coneGlacier caveGlacier headIce divideGlacier tongueIcefallLateral moraineMedial moraineMoraineMoulinPenitenteRandkluftSéracTerminusAblationAccumulationBasal slidingCalvingMotionOutburst floodOverdeepeningPeriglaciationPluckingRetreatStarvationIce coreMass balanceJökulhlaupSubglacial eruptionSubglacial volcanoLandformsArêteCirque stairwayCrag and tailFinger lakeGlacial hornGlacial lakeGlacial striaeHanging valleyNunatakP-formRibbon lakeRoche moutonnéeSuncupTrough lakeTrough valleyTunnel valleyValley stepZungenbeckenDrumlinErratic blockMoraine-dammed lakePulju moraineRogen moraineSevetti moraineTerminal moraineTill plainVeiki moraineGlaciofluvialAlpentorDiluviumGiant current ripplesKame deltaKettle holeOutwash fanSandurUrstromtalGlaciers on MarsClimbingRock climbingBig wallMulti-pitchBoulderingCompetitionTraditionalFree soloDeep-water soloRope soloTop ropingArtificialOverhang / RoofMountaineeringAlpineVia ferrataHimalayanAlpine styleExpedition styleDry-toolingScramblingHillwalkingBuilderingCanyoningCommercialParkourRopes courseRooftoppingRoof and tunnel hackingAlpine clubsClimbersPiolet d'Or winnersIFSC World Cup winnersIFSC World Championships winnersIFSC victoriesEight-thousandersEverestEquipmentBrandsHistorical eventsGrade milestonesFirst ascentsTechniqueTerminologyDaisy chainAnchorAscenderBelay deviceAuto belayGlassesGlovesBoulder matCarabinerMaillonClimbing ropeDynamicStaticDescendersFigure-8HarnessSkyhookHammerLanyardCopperheadPortaledgeQuickdrawGrigriCamalotTricamAlpenstockAbalakov threadBottled oxygenCramponsIce axeIce toolIce screwMountaineering bootAvalanche cordTranseiverSnow anchorSnowshoeAbseilingAustralianDülfersitzBelayingFront pointingGlissadingJumaringLeadingFlashingOnsightingRedpointingRescueCrevasseSelf-arrestSimul-climbingSpottingTraversingTyroleanApe indexApproach shoeClimbing routeGuidebookChippingFirst ascentExposureFall factorGradesGuidesBachar ladderCampus boardHangboardMoonBoardAlpine JournalAlpinistAmerican Alpine JournalCanadian Alpine JournalDesnivelHimalayan JournalPlaninski VestnikRock & IceSummitThe AlpinistEl CapitanThe Dawn WallHard GritBlack DiamondCascade DesignsDeuterEarly WintersEastern Mountain SportsFive TenFrostline KitsGERRY Mountain SportsGrivelHolubar MountaineeringJanSportSierra DesignsLa SportivaLowe AlpineMammutMarmot Mountain WorksMilletMountain Equipment Co-opMountain Safety ResearchOutdoor ResearchPatagoniaThe North FaceTherm-a-RestWild CountryNationalAccess FundAlpine ClubAlpine Club of CanadaAmerican Alpine ClubAppalachian Mountain ClubAustrian Alpine ClubBritish Mountaineering CouncilClub Alpin FrançaisClub Alpino ItalianoFederación Española de Deportes de Montaña y EscaladaFédération française de la montagne et de l'escaladeGerman Alpine ClubSouth African Climbing FederationSouth Tyrol Alpine ClubSwiss Alpine ClubUSA ClimbingInternational Federation of Sport ClimbingInternational Climbing and Mountaineering FederationUnion Internationale des Associations de Guides de MontagnesUnion of International Mountain Leader Associations