How can fossils be used to determine the relative ages of rock layers ?

Using the law of superposition, scientists can tell the relative age of the rock layer.Relative age does NOT tell the exact age. Index fossils can be used to helpdetermine the relative age of rock layers. Index fossils are from species that only existed for a short time.

What is the question? if you were looking to design a method of separating something, you can separate this compound by putting both in water and allowing the water to dissolve the sugar. then pour it into another beaker and evaporate it then boom! salt and sugar : )