Simple machines

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Across
  1. 2. wheel and axle device that is turned when you open a door
  2. 3. lever used for digging holes in the ground.
  3. 4. a simple machine used to separate something; made up of two inclined planes back-to-back
  4. 5. part of a water bottle with a screw
Down
  1. 1. type of simple machine that is a flat surface with one end higher than other