what sound wave. charters tics of sound.
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There are five main characteristics of sound waves: wavelength, amplitude, frequency, time period, and velocity....
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Effects of Air Pollution
High levels of air pollution can cause an increased risk of heart attack, wheezing, coughing, and breathing problems, and irritation of the eyes, nose, and throat. Air pollution can also cause worsening of existing heart problems, asthma, and other lung complications.
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