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Across
  1. 4. - The type of bond where atoms share electrons.
  2. 6. - The study of fossils and ancient life forms.
  3. 8. - The outermost layer of the Earth’s atmosphere.
  4. 11. - The change of a substance from a liquid to a solid.
  5. 12. - The process by which plants release water vapor into the atmosphere.
  6. 13. - The principle stating that energy cannot be created or destroyed, only transformed.
  7. 14. - The branch of science that studies earthquakes and their effects.
  8. 15. - The system of classification of living organisms.
Down
  1. 1. - The process by which living organisms produce offspring.
  2. 2. - The process by which liquid water turns into vapor.
  3. 3. - The basic unit of heredity in living organisms.
  4. 5. - The branch of science concerned with the physical properties of matter and energy.
  5. 7. - The unit of measure for the amount of substance in chemistry.
  6. 9. - The branch of biology that deals with the structure and function of tissues.
  7. 10. - The scientific study of celestial bodies and the universe.