English is easy

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Across
  1. 3. a triangle with three equal interior angles
  2. 6. a triangle in which all three sides have the same length
  3. 8. capable of being broken down especially into innocuous products by the action of living things (such as microorganisms)
  4. 10. made or produced by human beings rather than occurring naturally
  5. 11. material that is used to stop the passage of electricity, heat, or sound from one conductor to another
Down
  1. 1. the measure of the ease at which an electric charge or heat can pass through a material
  2. 2. converted into carbon or a carbonic residue
  3. 4. able to adapt or be adapted to many different functions or activities
  4. 5. act of unnecessarily postponing decisions or actions
  5. 7. being or seeming to be everywhere at the same time, omnipresent
  6. 9. a triangle with unequal sides