briefly describe the two major problems facing the water supply in southwestern U. S. Be sure to use complete sentences.

Which mathematical relationship should you us to convert moles of a substance into grams

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.

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)