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Atmospheric photochemical reactions

Atmospheric photochemical reactions – chemical changes which proceed under the influence of solar radiation in the atmosphere. Some of atmospheric photochemical reactions can cause formation of a smog, for example, components of emissions of oil processing productions or the exhaust (fulfilled) gases of internal combustion engines.

 
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Was considered earlier that yawning enriches an organism with oxygen. However this opinion was disproved. Scientists proved that yawning, the person cools a brain and improves its working capacity.