Mr. Blast’s classes are studying different forms of energy and how energy travels through a medium. They learn that sound waves transfer energy through a material. Which of these materials could sound waves travel through? Choose the three that apply. A. air
B. outer space
C. rock
D. water

The world wars of the twentieth century immediately led to a. the establishment of a communist bloc in eastern europe b. the urbanization of europe’s societies c. an emphasis on humanism d. an emphasis on ties to greek and roman societies select the best answer from the choices provided. a b c d