Which devices might use electromagnets? Check all that apply.

audio speakers
plastic combs
trains
doorbells
revolving chairs
cranes

Smog is the term used to describe the combination of fog and smoke

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole