Unit 1:The History of Life on Earth

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Across
  1. 6. the preserved remains or traces of a once-living organism
  2. 10. data, or information, that either supports or counters a scientific theory or idea
  3. 11. the variety of species on Earth
  4. 12. the process of determining whether one rock, fossil, or event is older or younger than another
  5. 13. a well-tested explanation of scientific observations and experiments that is supported by a large amount of evidence
  6. 14. the limitations on an engineering solution
Down
  1. 1. an event in the history of life on Earth in which a large number of species go extinct over a relatively short time period
  2. 2. the process of determining the approximate age of a rock, fossil, or event
  3. 3. the history of life on Earth as documented by the fossils collected so far
  4. 4. a representation of an object or process that makes important aspects easier to observe
  5. 5. when all members of a species die and the species no longer exists
  6. 7. a model used to study the history of Earth that divides this history into blocks of time such as geologic eras and geologic periods
  7. 8. the requirements that must be met for an engineering solution to be considered successful
  8. 9. a description of a natural phenomenon that has been repeatedly tested and appears to be without exception