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​