Planet Earth Crossword Puzzle!

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Across
  1. 2. rot or decompose through the action of bacteria and fungi
  2. 5. a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.
  3. 9. Earth material is a measure of how old it actually is in years
  4. 11. a term that describes time
  5. 12. the gradual process of being eroded by natural forces.
  6. 14. the central portion of the earth which lies below the mantle.
  7. 16. the act of rotating around a center or axis.
  8. 17. the outer layer of the earth's surface.
  9. 18. a specific area of the earth that falls between the core and the crust.
  10. 19. a prolonged period of time without rainfall.
Down
  1. 1. The geologic age of a fossil organism, rock, geologic feature, or event
  2. 3. the determination of the age or date of organic matter from the relative proportions
  3. 4. a scientist who studies the history of life on Earth through the fossil record
  4. 6. a fossil that is useful for dating and correlating the strata in which it is found.
  5. 7. a layer of sedimentary rock or soil, or igneous rock that was formed at the Earth's surface
  6. 8. the central like the earth revolves around.
  7. 9. the specific gas that surrounds the earth.
  8. 10. large areas of salt water that surround much of the earth's surface.
  9. 13. the made up line around the earth that shows how far the North and South poles are.
  10. 15. any preserved remains, impression, or trace of any once-living thing from a past geological age
  11. 16. the process of moving around a center or axis.