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Machines, processes and cycles

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  • a small, thin branch of a tree
    twig
  • a long metal bar that connects two wheels on a vehicle
    axle
  • lasting a very long time
    perennial
  • the action of spreading across or moving away over a large area, or of making people or things do this
    dispersal
  • an amount of something that is available for use
    supply
  • something that opens and closes to control the flow of liquid or gas
    valve
  • What's this?
    piston
  • damage and destruction
    devastation
  • any new growth on an already existing plant
    shoot
  • a piece of equipment that provides hot water for a house
    boiler
  • the process of leaves falling off a plant, or of making this happen
    defoliation
  • a thin, straight pole
    rod
  • a shape with circular ends and long, straight sides, or a container or object shaped like this
    cylinder
  • a small object that you push up or down with your finger to turn something electrical on or off
    switch
  • the part of something that you use to hold it or open it
    handle
  • a large machine that produces power by using gas, steam, etc to turn a wheel
    turbine
  • a place where a leaf and stem join on a plant
    node
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