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glacier – n. very large area of ice that moves slowly down a slope or valley or over a wide area of land
retreat – v. go away from one place to another
assume – v. think that something might be or is likely to be true, but without actual proof
reminder – n. thing that causes someone to remember something
temporary – adj. happening only for a short or limited time
pattern – n. a particular way something is repeated
impact – n. the effect something has on something else
