Chapter 9 Crossword

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Across
  1. 3. Putting events in the order in which they happened
  2. 4. The study of rocks and rock formations
  3. 5. Finding the exact age of something in years
  4. 6. The remains or traces of a long dead plant or animal
Down
  1. 1. A substance composed of only one kind of atom
  2. 2. A scientist who studies and identifies fossils