1) Which best explains what happens to most materials when they are heated? a) They expand. b) They contract. c) They double in size. 2) What happens to metal railroad tracks during the heat of a summer day? a) decrease in weight b) increase in weight c) decrease in length d) increase in length 3) Which best explains why the handles of many cooking pans are made of plastic? a) Plastic melts easily. b) Plastic freezes easily. c) Plastic is a good conductor of heat. d) Plastic is a poor conductor of heat. 4) Which would make the best roof material for a miniature solar oven used to cook meat? a) cement b) glass c) paper d) wood 5) Which best explains why a full glass bottle of water should not be stored in a freezer? a) b) c) d)

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