What is the answer to '(and 9) "As in the lowly air of _____ " ("Iolanthe", or Ballesteros Island eruption)'?

Question

What is the answer to '(and 9) &#34;As in the lowly air of _____ &#34; (&#34;Iolanthe&#34;, or Ballesteros Island eruption)'?

Accepted Answer

The answer is SEVEN.