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Iditarod An annual dog sled race held in the Iditarod Trail between Anchorage and Nome. runners the long, narrow metal or wood strips on which a sled slides outdistance to travel further than or way of someone or something else mukluks Eskimo boots made of the skin of a seal or reindeer mushers dogsled drivers towline rope or chain used by a vehicle or animal to pull something else waders high, waterproof boots levee an embankment designed to prevent the flooding of a river(usually made from sand or soil) river system All the streams and rivers that flow into a larger river sandbaggers a person who fills bags of sand to help build a levee tributaries small river or stream that flows in to a larger river or stream; a branch of the river tidal wave a huge destructive wave (especially one caused by an earthquake, volcano, storm,etc) crevasse a crack or fissure in a glacier, which can be six inches or hundreds of feet deep and wide precipice a cliff; the edge of a dangerous situation, ledge fissures narrow cracks in glaciers porters a person who is hired to carry loads triangulation Using three points to determine the height of a mountain ascent a movement upward