SL2: How can I move AND grow an object?

Here's the challenge:

An image of a glass pot on a stove. The pot is filled with water. As I turn up the heat, bubbles form on the bottom and begin to rise, but collapse before reaching the surface. Continuing to increase the heat, more bubbles form and grow and some move all the way to the surface and pop. Adding more heat produces rapid boiling.

The issue is, mainly, how to grow a bubble, while it is traveling on a curvy path. This is driving me nuts. I've looked at the tutorials and just when I think I understand it, I can't make it work.

Any suggestions or guidance would be a boon.


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