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You can continue to fill the funnels as different classes arrive.Empty the graduated cylinders between classes if the volume is more than about 25 ml.The exercise they will go through of working backwards from measurements to age should help them understand how scientists use carbon dating to try to determine the age of fossils and other materials.

This lesson is the third in a three-part series about the nucleus, isotopes, and radioactive decay.

The first lesson, Isotopes of Pennies, deals with isotopes and atomic mass.

The second lesson, Radioactive Decay: A Sweet Simulation of Half-life, introduces the idea of half-life.

By the end of the 8th grade, students should know that all matter is made up of atoms, which are far too small to see directly through a microscope.

There were no eyewitnesses, but there are several suspects. You need to determine the exact time at which Frosty was put into the funnels to melt away, leaving no trace.