Physical science

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Across
  1. 2. a part of Japan that got nuked
  2. 6. an energy that separates lightning
  3. 7. an alternative of number of 49
  4. 8. an alloy of iron and carbon
Down
  1. 1. a chemical element
  2. 3. something that takes up space
  3. 4. a mineral in the ground
  4. 5. a form of a elements