![](/nationalgeographic/adventurer_november_december_2019/activity_icy_vocab/799407/Author_Bernal_NG_tent.480_0_1.png)
![icy vocabs](/nationalgeographic/adventurer_november_december_2019/activity_icy_vocab/799406/icy_vocab.320_0_1.png)
Hello.I'mM.Jackson,ageographeranda glaciologist.Istudyglaciersaroundtheworld.Aglacierisalargebodyoficemovingslowlydownaslopeorvalleyorspreadingoutonland.Theendpointofaglacier is
itsterminus.Whenaglacierflowsintowater,theicecancalve, orbreak off.
Aseracisaridgeoficeonthesurfaceofaglacier.Thesestickuplikesharkfins.Theycanbefuntoclimb.Whileclimbingnearone,Islippedandfellintoacrevasse.
Thankfully,myteamwasnearbyandfishedmeoutofthedeep,icy crack.
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