Birkeland

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Across
  1. 3. his electromagnetic ____ famously exploded
  2. 5. youngest full professor of ___
  3. 7. harvested ___ from the air for fertilizer
  4. 9. age of first scientific paper
Down
  1. 1. number of children
  2. 2. Birkeland first name
  3. 3. explained how polar electric ___ flowed
  4. 4. Royal Frederick U. now known as U. of ____
  5. 6. theories proved by NASA ____ probe
  6. 7. nominated 7 times for the __ Prize
  7. 8. title King of the Northern ____