Geologic Time

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Across
  1. 3. a mountain or hill through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust
  2. 4. The law that states the oldest rocks are on the bottom and the youngest rocks are on top
  3. 6. Determining age by using radioactive isotopes to find a more exact date
Down
  1. 1. Where younger layers crosscut older layers, such as a volcanic rock vein cutting through older sedimentary layers
  2. 2. The preserved remains or traces of organisms that lived in the past
  3. 5. Means to last or retain certain characteristics over a long period of time