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This activity has students working as archaeologists.

Then in Phase 2 of the project, the teacher will provide the students with plastic bins each representing a different stratum of the archaeological site.

By measuring the ratio of uranium-235 to lead, scientists can calculate the age of the rock.

Strand 1: Inquiry Process Concept 2, PO 5: Record observations, notes, sketches, questions, and ideas using tools such as journals, charts, graphs, and computers.

For example, in a given sample of rock, after 713 million years, half of the originally-present uranium-235 will be changed to lead: this is the "half-life" of uranium-235. Origin and Evolution of Earth System: Geologic time can be estimated by observing rock sequences at various locations.

After another 713 million years, half of what was left will have decayed, etc. Current methods include using the known decay rates of radioactive isotopes present in rocks to measure the time since the rock was formed.

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The history of Africa begins with the emergence of Homo sapiens in East Africa, and continues into the present as a patchwork of diverse and politically developing nation states.

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