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Cassiar Mountains

This part of the Rocky Mountain Range in the Yukon Territory of Canada is an excellent example of mountains on Earth. This space shuttle image was taken when the sun was low on the horizon; the sharp shadows on the snow-covered peaks show how rough and uneven the area is. These mountains are so remote and rugged that ground surveys of the area are very expensive. Due to remote-sensing techniques developed for planetary exploration, many such areas can now be observed and studied from space at much less cost and effort.

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