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Dating Methods

Across
Works on anything organic
Uses the accumulation of changes to an organisms DNA to help determine the time since two species diverged
Like strata are related to the same event using rocks and fossils
Artifacts are time-specific
Down
Energy trapped in stone up to 800,000 years old
Using volcanic rock and ash to date materials over 200,000 years old
Using bone an teeth to examine the evolution of animals
The earth's magnetic field shifts (about every 750,000) years - CRAZY!
Examination of growth rings on trees
Comparing human and animals bones to see if they have absorbed the same amount of this substance