Science Vocab 3

12345678910111213
Across
  1. 2. The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
  2. 5. A principle that states that younger rocks lie above older rocks if the layers have not been distributed.
  3. 7. The standard method used to divide earth's long natural history into manageable parts
  4. 9. A long cylinder of ice obtained from drilling through ice caps or ice sheets ; used to study past climates
  5. 11. The scientific study of the origin, history, and structure of the earth and the processes that shape earth
  6. 13. A principle that geologic processes that occurred in the past can be explained by current geologic processes
Down
  1. 1. The weather conditions in an area over a long period of time
  2. 3. Any method of measuring the age of an event or object in years
  3. 4. The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
  4. 6. A method of determining the absolute age of an object by comparing the percentages of a radioactive isotope to a stable isotope
  5. 8. A fossilized structure, such as a footprint or coprolite, that formed in sedimentary rock by animal activity on or within soft sediment.
  6. 10. Any method of determining whether an event or object is older or younger than other events or objects.
  7. 12. geologiccolum