atmosphere - layer of air that surrounds the earth, Sun - all weather and climate are caused by this, Humidity - the amount of water in the atmosphere, Atmospheric pressure - weight of the air over Earth's surface, Warm Air - light weight and moves from low to high, Cold Air - heavier: moves from high to low, Climate - long term conditions in a certain region over a long period of time, Weather - conditions in the atmosphere at given time or place,

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