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The familiar snow-clad peaks of the Cascade Range are part of a 1,300 km (800 mi) chain of volcanoes, which extends from northern California to southern British Columbia.

See More Half-Life : Licorice Description: With the Half-Life Laboratory, students gain a better understanding of radioactive dating and half-lives.

Photo Credit: Purpose To learn about sources of high-energy radiation and calculate student exposure to ionizing radiation over the past year.

Context This lesson was developed by the Challenger Center as part of NASA's MESSENGER Mission, of which Science Net Links is a partner.

Lake Geneva, WI [email protected] Grades: 7-8 (Spiraled) (See Geologic Time Scale II for the 8th grade activity) Overview of Lesson: Students will research the geologic time scale. Purpose of activity: To reinforce learning about types of radioactive decay (alpha, beta and gamma decay). The idea for the game came from the card game "War" where you try to give your opponent all the cards.

The "nuclear" part refers to the nuclei of atoms.) NOTE: Information about the types of decay is given in the instructions so that it is possible to play this game without having already studied radioactivity.

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