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Across
  1. 5. The study of the Earth's atmosphere and weather patterns.
  2. 7. The speed at which an object travels in a given amount of time.
  3. 8. A positively charged particle in an atom's nucleus, with a mass nearly equal to a proton's.
  4. 9. The measure of the amount of matter in an object.
Down
  1. 1. A measure of the average kinetic energy of particles in a substance.
  2. 2. The process of converting light energy into chemical energy in plants.
  3. 3. The smallest prime number.
  4. 4. A branch of mathematics dealing with the properties and relationships of shapes.
  5. 6. A polygon with eight sides.