Fire Works

As we drove home from Life Group last night, while talking about watching fireworks on TV Kevin saw some fireworks burst in the air and squeeled with great joy. Then he got quiet which meant that he fell asleep or was thinking about something. A few minutes later he said, "Dad... why is it called 'works'?"

What a thinker.

Stumped and giving me the "okay, know-it-all, chime in here" look he replied with the standard Dad-doesn't-really-know response, "I guess we'll have to find out."

So my question to you, Why is it called fire "works"?