Earth's History

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Across
  1. 5. an explanation of scientific phenomena that is supported by a large amount of evidence
  2. 6. the first form of plant or animal life; made entirely of molecules and atoms
  3. 8. the preserved remains or traces of a once-living organism
  4. 9. a representation of an object or process that makes important aspects easier to observe
  5. 12. data, or information, that either supports or counters a scientific theory or idea
  6. 13. a description of a natural phenomenon that has been repeatedly tested and appears to be without exception
  7. 14. layers
  8. 15. solid material that is broken down by weathering and erosion
  9. 16. wearing away of the earth’s surface by wind or water
  10. 17. the smallest unit of a chemical substance; made up of two or more atoms
  11. 18. the leading scientific theory explaining how the universe began
Down
  1. 1. the law that says older rock layers are found below younger rock layers
  2. 2. the process of determining the approximate age of a rock, fossil, or event
  3. 3. the history of the earth divided into eons, eras, periods, and epochs
  4. 4. a solid mass made up of minerals
  5. 7. the process of determining whether something is older or younger than another
  6. 10. a system that includes a star and all the celestial objects that orbit that star
  7. 11. the basic building block of matter