science choice board

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Across
  1. 4. hard outer layer
  2. 6. inner sphere
  3. 8. mainly molten iron and nickel
Down
  1. 1. rubs against one another
  2. 2. plate tetonic goes away from each other
  3. 3. mostly solid bulk of earths interior
  4. 5. helps with communication and more
  5. 7. very old bones/other objects