Geologic Time Scale

12345678910
Across
  1. 3. the technique scientists use to determine the absolute age of a material
  2. 4. in undisturbed sedimentary rock layers, older layers of rock lie beneath younger layers
  3. 9. any rock fragment thats included inside of another rock is older than the rocks its included in
Down
  1. 1. an igneous rock that forms when magma cools and hardens after cutting through existing rock
  2. 2. any feature that cuts across a sequence of rocks is younger than everything it cuts
  3. 5. the actual or exact age of a rock or fossil, or how long ago it formed
  4. 6. the science of the study of earth
  5. 7. describes the age of a rock or fossil in comparison to another rock or fossil
  6. 8. a gap in the rock record
  7. 10. forms of life which existed during limited periods