Compare and contrast melting and boiling

In 2002, the rare earth elements mine in mountain pass, california was closed because

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.