10th grade review crossword puzzle

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Across
  1. 2. A substance that cannot be separated into simpler substances by chemical means (7)
  2. 3. The force that attracts a body towards the center of the earth (7)
  3. 5. The action or process of moving or being moved from one place to another (9)
  4. 8. A group of stars forming a recognizable pattern that is traditionally named after its apparent form (7)
  5. 10. The study of the earth's physical and cultural features (8)
  6. 11. A large body of air with uniform temperature, humidity, and pressure (9)
  7. 14. The smallest unit of a substance that retains the chemical and physical properties of the substance (7)
Down
  1. 1. A line that intersects a circle at two points (7)
  2. 4. The study of matter and energy and the interactions between them (10)
  3. 6. A polygon with three sides (6)
  4. 7. The measure of how much mass is contained in a given volume (9)
  5. 9. The highest point of a wave (5)
  6. 12. A large natural stream of water flowing in a channel to the sea, a lake, or another such stream (4)
  7. 13. A material that allows electricity to flow through it easily (8)