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(This page has been archived and is found on the Internet Archive.) In addition to using answers to students' Analysis questions and their graphs for evaluation, consider having them respond to the following in their science journals or as a homework essay: Pretend you are on a month-long field trip to dig for artifacts that might have been left from the pre-colonial period in the United States.

Write a letter to a friend explaining what radiocarbon dating is.

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They should also understand that the atoms of any element are alike but are different from atoms of other elements.

Atoms may stick together in well-defined molecules or they could be packed together in large arrays.

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.

Living things have about 15 disintegrations per minute per gram of carbon.

Because living things constantly interchange carbon atoms, the amount of carbon-14 remains constant, but when organisms die, no new carbon-14 enters the organism.Carbon-14 is produced constantly as our atmosphere is bombarded by cosmic rays.It is incorporated into the carbon cycle, so that all living things, including you, contain radioactive carbon-14.For students, understanding the general architecture of the atom and the roles played by the main constituents of the atom in determining the properties of materials now becomes relevant.Having learned earlier that all the atoms of an element are identical and are different from those of all other elements, students now come up against the idea that, on the contrary, atoms of the same element can differ in important ways. 79.) In this lesson, students will be asked to consider the case of when Frosty the Snowman met his demise (began to melt).You may group them in any size group, but working in pairs is optimal for this exercise.

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