Sound wave is a pressure caused by the vibration of something in a medium that transfers anergy, like air.
Answer: The Industrial Revolution.
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Explanation:
Wars might be caused because different cultures might think they are superior to others which could cause war.
Explanation:
Using a few inexpensive, energy efficient measures can reduce your energy bill and, at the same time, reduce air pollution. Heating and cooling systems use more energy than any other systems in American homes. Natural gas and electricity are used to heat most American homes, electricity to cool almost all.
