Engineering Towers

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Across
  1. 1. Rhymes with 'spark'
  2. 3. Underlying or supporting structure
  3. 4. A type of engineer
  4. 7. The opposite of tension
  5. 9. Structure built on top of something else
  6. 10. The opposite of compression
Down
  1. 1. Starts with an 'A', ends with a 'T', and has a 'butmen' in between
  2. 2. 'suspend'
  3. 5. A synonym of this is 'cornerstone'
  4. 6. Rhymes with 'fuss'
  5. 8. Synonyms are length, or space; rhymes with 'fan'