Science Crossword

123456789
Across
  1. 4. how strong or weak a sound is
  2. 5. to move quickly back and forth
  3. 7. how high or low a sound is
  4. 8. movement that takes energy from place to place
  5. 9. used to push two objects apart
Down
  1. 1. plane slanted surface
  2. 2. an inclined plane wrapped around a rod
  3. 3. machines tools that make it easier to do work
  4. 4. a bar used to lift something
  5. 6. dark or shaded area