WHY ARE WHEELS IMPORTANT?

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Across
  1. 2. a device, often consisting of connecting sets of wheels with teeth (= points) around the edge, that controls how much power from an engine goes to the moving parts of a machine
  2. 5. the ability of a wheel or tyre to hold the ground without sliding
  3. 7. a long, thin pole made of wood or metal
  4. 8. to turn or cause something to turn in a circle, especially around a fixed point
  5. 10. to make something into small pieces or a powder by pressing between hard surfaces
  6. 11. a bar connected to the centre of a circular object such as a wheel that allows or causes it to turn, especially one connecting two wheels of a vehicle
  7. 12. the outer, often curved or circular, edge of something
Down
  1. 1. the movement of people or goods from one place to another
  2. 3. any of the rods that join the edge of a wheel to its centre, so giving the wheel its strength
  3. 4. to pull something heavy slowly and with difficulty
  4. 6. (the study and knowledge of) the practical, especially industrial, use of scientific discoveries
  5. 9. to move someone or something from one place, vehicle, person, or group to another