Geologic Time Vocab

12345678910
Across
  1. 3. The branch of Earth Science that focuses on the Earths layers and processes that have shaped the Earth throughout it's history
  2. 5. Method works because some unstable isotopes of some elements decay at a known rate into daughter products
  3. 8. Outline of the major divisions in Earth's history
  4. 9. The amount of time it takes for half of a remaining isotope to decay to a daughter product.
  5. 10. You might not know the exact age, but you can tell if one rock layer is older relative to another.
Down
  1. 1. Recognized to represent a period of time, or on radioactive decay of specific
  2. 2. Layers of rock
  3. 4. In a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones.
  4. 6. A fossil used to help determine the relative age of a rock strata sample
  5. 7. Marks the formation of the super continent, Pangaea