Your teacher sets two cups on a bench at the front of the class. One contains water dyed blue and the other clear water. The teacher says one cup is very salty water while the other is fresh water. You must figure out which is which. How would you do this?

pour some of the blue gently into the clear by letting it run down the side of the glass

Explanation:

If the blue stays on top of the clear, the clear is the salty water with higher density.

If the blue sinks to the bottom of the clear, the blue is the salty water with higher density.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.