? ??? pitch how high or low a sound is ??? ??? ??? precipitation any form of water that falls from clouds, such as rain or snow. ??? ??? ??? radiant energy energy that moves in waves. ??? ??? ??? reflection the bouncing of light off objects. ??? ??? ??? refraction the bending of light rays when they pass from one substance into a different substance. ??? ??? ??? solid matter that has a definite sh