Crossword Puzzle

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Across
  1. 3. "A large celestial body orbiting a star, like Earth."
  2. 5. "The process of rocks and soil being worn away by water or wind."
  3. 7. "The force that pulls objects toward the Earth."
  4. 8. "To change or adjust to new conditions."
  5. 11. "The force that resists motion between two surfaces."
  6. 13. "A gas in the air that humans and animals need to breathe."
  7. 15. "A branch of mathematics involving variables and equations."
Down
  1. 1. "The customs, arts, and social behaviors of a group of people."
  2. 2. "Something that represents an idea or concept, like a flag."
  3. 4. "The measure of electrical energy in a circuit."
  4. 6. "A nutrient essential for building and repairing body tissues."
  5. 9. "The line where the sky seems to meet the land or sea."
  6. 10. "A conversation between two or more people."
  7. 12. "A tool used to find directions."
  8. 14. "A community of living and non-living things in an environment."