Chain Crosswords Long Nature Medium — Set 21

Medium 13×13 Set 21
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Across
  1. 1. A pattern of energy moving through space or matter
  2. 5. The distance between one wave peak and the next
  3. 7. How tightly packed the matter is in something
  4. 8. The process of getting bigger or more developed
  5. 9. The amount of space something takes up
  6. 10. A curved piece of glass that bends light
Down
  1. 2. The speed of something in a given direction
  2. 3. All the chemical processes in your body that keep you alive
  3. 4. To study something carefully to understand it
  4. 6. A chemical change when substances interact