Ratiometric dating

If 25 of them land face-up, they'll only toss 25 in the next round.

When students have collected their data, they can make a chart to show the decay of the material.

Anyone can earn credit-by-exam regardless of age or education level.

Give students 40-50 pieces of candy; have them count the exact number to save you some time.

Then, ask them to create the following chart on a piece of paper: Students will expand the chart based on their needs as they run the simulation.

A commonly used radiometric dating technique relies on the breakdown of potassium (Ar in an igneous rock can tell us the amount of time that has passed since the rock crystallized.

If an igneous or other rock is metamorphosed, its radiometric clock is reset, and potassium-argon measurements can be used to tell the number of years that has passed since metamorphism.

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