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Dominated by two gigantic pyramids and a huge sacred avenue, the city, its architecture, art, and religion would influence all subsequent Mesoamerican cultures, and it remains today the most visited ancient site in Mexico.
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When an archeologist has identified the source of the obsidian from which an artifact is made, he or she may be able to date the artifact using the obsidian hydration technique.
This technique of dating obsidian artifacts measures the microscopic amount of water absorbed on freshly broken surfaces.
C dating, thermoluminescence is related to radioactive decay.
Thermoluminescence is produced by radioactive decay particles (electrons), trapped in mineral grains.