5) A box weighing 75 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from t
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The outer Ozone is helpful. Ozone occurs in two layers of the atmosphere. The layer closest to the earth's surface is called the troposphere; ground-level or (bad) ozone is an air pollutant that is harmful to breathe and it damages crops, trees and other vegetation. It is a main ingredient of urban smog.
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