Chapter 6 menu crossword puzzel

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Across
  1. 5. are the preserved remains or traces of living things
  2. 7. magma cools and hardens into a mass of igneous rock called an intrusion
  3. 8. is a record of the geologic events and evolution of life forms as shown in fossil record
  4. 10. is its age compared to the ages of other rocks
  5. 12. lava that hardens on the surface and forms igneous rock
  6. 13. it no longer exists and will never again live on Earth
  7. 14. is a ball of dust,gas and ice that orbits the sun
Down
  1. 1. scientist who study fossils
  2. 2. of a radioactive element is the time it takes for half of the radio active atoms to decay
  3. 3. is the change in living things over time
  4. 4. these elements release particle and energy in a process
  5. 6. a absolute age of a rock is the number of years that have passed since the rock formed
  6. 9. is a gap in the geologic record
  7. 11. eras are subdivided into units of geologic time
  8. 12. geologist divide the time between precambrian time and the present into three long units of time