Geologic Time

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Across
  1. 6. a microscopic single celled organism with no nucleus or membrane
  2. 9. unstable isotopes can decay at a rate into daughter products
  3. 10. The amount of time it takes for half a remaining isotope to decay to a daughter product
Down
  1. 1. assigning age to materials to discover the age of rocks
  2. 2. you don't know the exact age but can tell if one rock layer is older relative to another layer
  3. 3. atoms with the same number of protons but different numbers of neutrons
  4. 4. the emission of energy in the form of ionizing radiation
  5. 5. scientist that studies solid, liquid, and gas of the earth
  6. 7. representing a period of time or radioactive decay of specific isotopes
  7. 8. rock layers