Students in grades 6-8 will say "Rocks Rock!"  See their excitement, when students review the earth material facts surrounding "rocks".  There are 96 fascinating facts on this 60cm inflatable vinyl ball.  Tossing the ball around the classroom, bouncing it on the playground or spinning it around at homes makes for a fun and easy way to learn or review rocks.  Latex free with repair patch included as well as Teacher's Guide and answer sheet.