![](/nationalgeographic/pioneer_november_december_2019/activity_icy_vocab/800331/Author_Bernal_NG_tent.480_0_1.png)
![Icy Vocab](/nationalgeographic/pioneer_november_december_2019/activity_icy_vocab/800330/icy_vocab.320_0_1.png)
Hello. I'mM.Jackson. Iama glaciologist. Istudyglaciersaroundtheworld. Aglacierisamovingriverofice. ItflowsoverEarth's surface.
Aseracisaridgeoficeonaglacier.Seracscanbefuntoclimb.Acrevasseisacrackinaglacier.Ifellinadeepone,once.Luckily,myteamfishedmeoutof it!
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