to become dehydrated [ˌdiːhaɪˈdreɪtɪd] - to lose too much water from your body, a climber, frostbite - a condition caused by extreme cold, that makes your fingers and toes swell, become darker, and sometimes fall off, high altitude - high above the sea level, oxygen [ˈɒksɪdʒən] - a gas that has no colour or smell, is present in air, and is necessary for most animals and plants to live, a tent,

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