Geologic Time Vocab

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Across
  1. 2. A fossil used to help determine the relative age of a rock strata sample
  2. 6. Outline of the major divisions in Earth's history
  3. 7. You might not know the exact age, but you can tell if one rock layer is older relative to another.
  4. 8. Marks the formation of the super continent, Pangaea
  5. 10. In a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones.
Down
  1. 1. Method works because some unstable isotopes of some elements decay at a known rate into daughter products
  2. 3. Recognized to represent a period of time, or on radioactive decay of specific
  3. 4. The amount of time it takes for half of a remaining isotope to decay to a daughter product.
  4. 5. The branch of Earth Science that focuses on the Earths layers and processes that have shaped the Earth throughout it's history
  5. 9. Layers of rock