A teacher sprinkles some iron shaving on a clear tray. She places two magnets in the shaving with the north ends facing each other. Based on the cause and effect relationship between the magnets, which phenomenon is the teacher modeling for her students?
![A teacher sprinkles some iron shaving on a clear tray She places two magnets in the shaving with the north ends facing each other Based on the cause and effect class=](https://us-static.z-dn.net/files/d88/b2f857cf0017388381c1581e65e0b27b.png)