Crossword

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Across
  1. 5. Force that slows motion when surfaces rub together
  2. 6. Community of living and nonliving things interacting together
  3. 8. Change or addition to a legal document, especially the Constitution
  4. 9. A story or account of events
  5. 10. Related to heat
  6. 14. Speed given in a direction
  7. 15. Using objects or images to represent ideas in literature
Down
  1. 1. Method of supplying water to farmland
  2. 2. Process plants use to make food using sunlight
  3. 3. Historical period known for renewed interest in art and learning
  4. 4. Advanced society with cities, culture, and government
  5. 7. Government system in which people vote for their leaders
  6. 11. Mathematical statement showing two things are equal
  7. 12. Height above sea level
  8. 13. Testable scientific prediction