In small groups, think of ten ways we witness substances change in state every day. Present your findings to the class. Remember that condensation and melting are examples of changes of state. Condensation is the point of change from a gas to a liquid. Melting is the point of change from a solid to liquid. Evaporation is also a way that liquids change to gases.​

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.