Answer:
The presence in the air of one or more contaminants in such a concentration and of such duration as to cause a nuisance or to be injurious to human life, animal life or vegetation.
Answer:
Mid-Level Clouds Are "Alto" Clouds
Clouds with the prefix "alto" are middle level clouds that have bases between 2000 and 7000 m (6500 to 23,000 ft.). Altostratus clouds are gray or blue-gray middle level clouds composed of ice crystals and water droplets.
Explanation:
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Tectonic plates
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