Hello.I'mM.Jackson,ageographeranda glaciologist.Istudyglaciersaroundtheworld.Aglacierisalargebodyoficemovingslowlydownaslopeorvalleyorspreadingoutonland.Theendpointofaglacier is
itsterminus.Whenaglacierflowsintowater,theicecancalve, orbreak off.

Aseracisaridgeoficeonthesurfaceofaglacier.Thesestickuplikesharkfins.Theycanbefuntoclimb.Whileclimbingnearone,Islippedandfellintoacrevasse.

Thankfully,myteamwasnearbyandfishedmeoutofthedeep,icy crack.