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This lesson is the third in a three-part series about the nucleus, isotopes, and radioactive decay.
On a separate sheet of paper, immediately record the volume of Frosty's melted remains (water) in your graduated cylinder and note the time on the clock.
Make a data table and, at regular intervals (you decide how long), record the time on the clock and the volume of water in the graduated cylinder.
By measuring how much carbon is left in a sample as well as its radioactivity, we can calculate when the organism died. In this activity, you will work backwards to solve a puzzle, much like scientists work backwards to find the time that an organism died." Procedure Give each student a copy of The Case of the Melting Ice student sheet.