1) Heating is... a) a process to rise temperature. b) a process to made materials. c) to warm our food. 2) What hapens to materials when we heat them? a) They cook them. b) It doesn't involes temperature c) It involves a change of temperature. 3) What things can expand with heat? a) Liquids and gases b) Liquids, solids, and gases c) Gases and solids. 4) Which air is more dense a) Cold air b) Normal air c) Hot air 5) What is the opposite of expansion a) Expansion b) Contraction c) Kinetic energy

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