Natural sc

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Across
  1. 3. A chemical reaction that happens when objects or substances are burned
  2. 4. A chemical reaction that happens in some living things,such as yeast and bacteria
  3. 5. Reactions These happen when atoms react and group together diffently
  4. 8. circuit A closed path through which electricity flows
  5. 10. A method used to separate solids from liquids in homogeneous mixtures
  6. 11. A method uses to separate substances of different density in heterogeneous mixtures
  7. 12. A device with a magnetic needle that always points north.We use it to orient ourselves
Down
  1. 1. Aconnecting wire,usually made of copper,erapped in plastic covering
  2. 2. A method used to separated liquids that have different boiling points in homogeneous mixtures
  3. 6. current The flow of electrical charges through materials
  4. 7. The component of an electric circuit which transforms electricity into another type of energy
  5. 9. A material which allows electrical charges to move