Vocab Tic-Tac Toe

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Across
  1. 1. a scientific method that can accurately determine the age of organic materials as old as approximately 60,000 years
  2. 5. one of the principles of geology scientists use to determine the relative ages of rock strata, or layers
  3. 6. the emission of energy in the form of ionizing radiation
  4. 8. divides up the history of the earth based on life-forms that have existed during specific times since the creation of the planet
  5. 9. method of age determination that makes use of the radioactive decay of uranium-238 to uranium-234
Down
  1. 2. a measure of how old it actually is in years
  2. 3. The amount of time that it takes one half of the atoms present to decay
  3. 4. the process of determining if one rock or geologic event is older or younger than another, without knowing their specific ages
  4. 7. the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers