Movie. North. Fish. What word can we all share?

What do you call a bear that lost all of it's teeth?

Oregon and Radium were hanging out when suddenly a treasure box fell and split them up. Now they all make beautiful music together.

I can happen in a finger, Or when tempers start to flare. I can steal a winning card, Or catch a moment in mid-air. Sometimes I mean 'enough!' With a crack, I make things pop. Four little letters. What am I?

The trees stand bare for many weeks, Then quietly change their clothes. No tailor comes to help them dress, yet every branch soon knows.