Science crossword vocab 4 i think?

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Across
  1. 2. A principle that geologic processes that occurred in the past can be explained by current geologic processes.
  2. 4. Fossil A principle that states that younger rocks lie above older rocks if the layers have not been disturbed.
  3. 7. dating A method of determining the absolute age of an object by comparing the relative percentages of a radioactive isotope and a stable isotope.
  4. 8. scale The standard method used to divide earth’s long natural history into manageable parts.
  5. 10. dating A principle that states that younger rocks lie above older rocks if the layers have not been disturbed.
  6. 11. The scientific study of the origin, history, and structure of earth and the processes that shape earth.
  7. 13. column An ordered arrangement of rocks that is based on the relative ages of rocks and in which the oldest rocks are at the bottom.
  8. 14. The trace or remains of an organism that lives long ago, most likely in sedimentary rock.
Down
  1. 1. The weather conditions of an area over a long period of time.
  2. 3. A break in the geological record created when rock layers are eroded or when sediment is not deposited for a long period of time.
  3. 5. dating Any method of measuring the age of an event or object in years.
  4. 6. A principle that states that younger rocks lie above older rocks if the layers have not been disturbed.
  5. 7. decay The process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element.
  6. 9. The time required for half of a sample of a radioactive isotope to break down a radioactive decay to form a daughter isotope.
  7. 12. core A long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates.