Animals breathe oxygen, exhale carbon dioxide, Oxigen is cycled, through the environment, plants take in carbon dioxide, and give off oxygen, photosyntesis, energy of the sun, water makes up between, 70 to 75 % of the earth, ocean, made salt water, glaciers, ice, ground water, 1%, atmosphere contains, vapor, the earth looks, blue, small particles of snow, snowflake, health effects of pollution, respiratory diseases , cardiovascular diseases , inflammation of throat , fatigue , cancer
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