How can you form layers of liquids

You know that ice floats in water, whereas a rock sinks. Not surprisingly, water and other liquids sometimes form distinct layers when poured together. 

Observe 5-mL samples of alcohol (dyed red), glycerol (dyed blue), corn oil, and water. Plan the 

WARNING Keep alcohol away from open flames. 

Did the liquids form four distinct layers If not, rinse out the graduated cylinder and repeat Steps 2 and 3 using a different order. 

Identify the order, from top to bottom, of the layers in the graduated cylinder. 

---