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  • 1. UNIT 9
  • 2. Some materials are better for a purpose than others.
  • 3.  Windows are made of glass because glass is transparent.
  • 4.  Houses are made from bricks because bricks are rigid.
  • 5. Magnetism
  • 6. Some objects are attracted to magnets.  These objects are  magnetic.
  • 7.  Only objects made from metal are magnetic.
  • 8. Bending Twisting Stretching Squashing
  • 9. Bend
  • 10. Natural and Manufacture d materials
  • 11.  Natural materials are made by nature.
  • 12.  Manufactured materials are made by people.
  • 13.  Many materials become hard when cooled and soft when heated.