Aluminum does not corrode in the same manner as iron does, because aluminum is harder to oxidize than iron. aluminum does not react with oxygen gas. a protective layer of aluminum oxide forms on the metal surface. iron gives cathodic protection to aluminum. the electrical circuit cannot be completed on an aluminum surface.

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of