LS 7- Ch 8 Crossword Puzzle (Use the Vocab list!)

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Across
  1. 2. the earliest period of Earth's history. Earth forms, cells form, life begins
  2. 3. the scientific name for modern humans
  3. 8. a hominid that is now extinct, but once lived alongside modern humans in Europe
  4. 9. the "calendar" scientists use to outline the history of the Earth
  5. 10. determining the age of a fossil by using radioactive atoms
  6. 11. when a species of organism dies out completely
  7. 13. the preserved remains of something that once lived a long time ago
  8. 15. the era of Earth's history we are in currently
Down
  1. 1. an early hominid. The first was nicknamed "Lucy"
  2. 4. the theory that claims the Earth's crust is broken into large pieces that float on the Earth's mantle
  3. 5. using other fossils with known dates to determine the date of an unknown fossil
  4. 6. the era in which most animal groups first show up in the fossil record. First plants as well.
  5. 7. a mammal with forward facing eyes and opposable thumbs. Ex: chimpanzee, gibbon, human
  6. 12. the era of Earth's history in which reptiles dominated
  7. 14. a primate that walks upright, includes humans and their immediate ancestors