"... just where DID all that force come from?"
Well, if it were compressed, that would indicate that some force compressed it, wouldn't it?
But what has this to do with evolution, or Darwin?
Air at sea level is compressed, relative to air at 10,000 feet.
So who does that? Or is it just in the nature of gravity, and air to produce it without the personal intervention of a personal G-d, a personal G-d who really really wants me to believe in him, but who somehow can’t be bothered to make me a phone call.