I kind of adapted this idea from a website I came upon for Montessori teaching and from the snowy/sleety weather we had last night.
While we were driving, a snow truck passed in front of us and sprayed us with some pebbles/salt grains. My daughter asked me about it and I explained that salt helps the ice melt more quickly and keeps ice from forming on the ground. She asked how, so I promised her that next morning we would do an 'experiment' to discover how. This excited her since she's been reading a mouse story , with the mouse getting dirty in one scene from a 'science experiment.' So she said excitedly, "tajruba 3ilmiyya?!" And I said, 'Yes!"
Today we took out two little bowls and two pieces of ice. I let my daughters take turns pouring salt on the 'experimental' ice cube. Then we moved around both bowls and got them little spoons to mix the ice. The ice with the salt melted very quickly! We learned about the different states of water, about different things that help ice melt more quickly.