Next she added sugar to cup number 2. Amazing! It dissolved as well.
Cup number 3 got some sand. I bet you are wondering why I have sand lying around my house.. After a couple of years of saying "oops we can't do this experiment because there is snow on the ground and we can't get the supplies" I got smart and looked through our science curriculum this summer and created a kit of everything we would need this year. The sand came courtesy of my friend Holly. It's official science experiment sand.
No J, no amount of stirring will dissolve that oil.
And there you have it folks. Sugar and Salt are soluble substances while sand and oil are not. Aren't you glad you learned something today? My kids are!