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The rise of the Aztec empire really began in 1150 with the fall of the Toltec empire. The Toltecs had established their state in Tula, which was to the north of what would become Tenochtitlan.
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Answer:
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The answer I think should be c
Answer:
These atoms will decay as the rock ages, and by measuring the ratio of radioactive isotopes within the rock, scientists can figure out how long it has been around. In 1913, geologist Arthur Holmes published “the Age of the Earth,” the first major effort to date the planet using radiometric dating.