A dog sled team competes in the World Championship Dog Derby in The Pas, Manitoba, Canada. Dog sled teams like this one delivered life-saving diphtheria medicine to Nome, Alaska, in 1925.
Photograph by W.E. Garrett, National Geographic
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region at Earth's extreme north, encompassed by the Arctic Circle.
person who participates or competes in sporting events.
storm with high winds, intense cold, heavy snow, and little rain.
outbreak of an infectious disease able to spread rapidly.
to disallow or prohibit.
to influence to act.
to set one thing or organism apart from others.
substance used for treating illness or disease.
driver of a team of sled dogs.
having to do with mental facilities and awareness.
type of team racing where athletes compete in sequence. Also called a relay race.
poisonous substance, usually one produced by a living organism.
cold, treeless region in Arctic and Antarctic climates.