Geological time scale

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Across
  1. 2. dating gives age in actual age
  2. 5. older rock at the bottom and younger at the top
  3. 7. is the amount of time it half of an isotope to decay to a daughter product
  4. 9. a branch of geology dealing with the arrangement of sedimentary rock layers or strata
  5. 10. indicates to geologists the boundaries in geological time
Down
  1. 1. inserting a knife into a cake and removing a piece
  2. 3. rock found inside of other rocks the older are the chunks
  3. 4. a scientist who studies the earths crust
  4. 6. deterimes the relative order of past events
  5. 8. radioactive decay of isotope represents a period of time