Ethanol and biodoesel are also <u>cleaner-burning</u> fuels than pure gasoline and diesel fuel.
I hope I helped! :)
By tightening a string you are actually putting more stress on the string you are giving it a new frequency that isn't natural.
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Answer: Tides are periodic rises and falls of large bodies of water. Tides are caused by gravitational interaction between the earth and the moon. The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon.