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