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glacier - n. a very large area of ice that moves slowly down a slope or valley or over a wide area of land
hydroelectric - adj. of or relating to production of electricity by waterpower
rush - v. to move very quickly
evacuate - v. to remove (someone) from a dangerous place
muddy - adj. filled or covered with mud (soft, wet dirt)
layer - n. a covering piece of material or a part that lies over or under another
advance - v. to move forward
seismic - adj. of, relating to, or caused by an earthquake
dramatically - adv. sudden and extreme
due to - adj. because of
instability - n. the state of being likely to change
region - n. a part of a country, of the world, etc., that is different or separate from other parts in some way
