A ski is narrow strip of wood, plastic, metal or combination thereof worn underfoot to glide over snow. Substantially longer than wide and characteristically employed in pairs, skis are attached to boots with bindings, either with a free, lockable, or permanently secured heel. Originally intended as an aid to travel over snow they are now mainly used recreationally in the sport of skiing. The two skis that are lying on top of each other make adjacent supplmentay angles. Two Angles are Supplementary if they add up to 180 degrees. This object can be found in ski lodges, or the slopes. People who ski use skis.
I got my picture from: http://en.wikipedia.org/wiki/Ski
I found my information about skis from: http://en.wikipedia.org/wiki/Ski
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