How to talk about science and paleontology

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Across
  1. 3. the shape of a bone, a shell, or a plant or animal that has been preserved in rock for a very long period
  2. 5. the study of the buildings, graves, tools, and other objects that belonged to people who lived in the past, in order to learn about their culture and society
  3. 6. not common or frequent; very unusual
  4. 8. a scientist who works with chemicals or studies their reactions
Down
  1. 1. any of the hard parts inside a human or animal that make up its frame
  2. 2. a type of reptile that became extinct about 65,000,000 years ago
  3. 4. the scientific study of organisms that lived on earth before there were written records
  4. 7. the scientific study of the natural processes of living things