Copper is used for electrical wirin g and cooking pans however iron is much more common on earth than copper why might copper be used instead of iron if iron is easier to maintain

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Which metals are called noble metals

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