12. When two magnets attract, they A. Break apart B. Change color C. Pull together D. Push together 13. When two magnets repel, they A. Break apart B. Change color C. Pull together D. Push together 14. Magnets have two ends, the north and south A. color C. pole B. corner D. region 15. Magnets have invisible A. Electric current B. Magnetic field C. signals D. sound waves