canyon - a deep valley with very steep sides, cavern - a large cave, spectacular - extremely good, exciting or beautiful, glacier - a large river of ice which moves very slowly, usually down a slope or valley, atmosphere - the layer of gases around the Earth, ecosystem - all the living things in an area and the effect they have on each other, forgo - not use/have/do something that is usual, threaten - to be likely to damage or harm something, period - full stop, cause - someone or something that makes something happen, climate - the general weather conditions usually found in a particular place,

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