Analyses of rock formations and the fossil record are used to establish relative ages. Place several strands of hair on the drop of mountant or water.
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In an undisturbed column of rock the youngest rocks are at the top and the oldest are at the bottom.
. For example rock layers show the sequence of geological events and the presence and amount of radioactive elements in rocks make it possible to determine their ages. Paper for drawing Pencil for drawing Procedure. Obtain a clean microscope slide and place a drop of mountant or water on it.
Examine the slide under the low- and high-power objectives of a microscope. Use forceps and slowly lower a coverslip onto the drop of mountant or water.
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