acid rain contributes to all of the following problems except: A) smog B) loss of biodiversity C) damage to vegetation D) advance chemical weathering

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

A60-tooth gear is connected to a 72-tooth gear.if the smaller gear turns 12 times,how many turns does the larger gear make?

What is the cause hearing loss in human being