Can duplicated movies be subject to masking?

Hi there everyone! I’m making a snowglobe for the holidays and as such, I’m looking to have it snow INSIDE the globe only. What I’ve done is make a mask for the globe so that the “snow” movie clip will only be visible within the globe. I also have a duplicate movie action in my main movie to create a lot of snow.

The problem, though, is that the duplicates do not get masked like the main snow clip. Is there a way to fix this? Any advice?

Here’s the code for the duplicate clips:
for (k=0; k<100; k++) {
duplicateMovieClip(_root.snow, “snow” +k, k);
}

Should I be putting this code somewhere else?

Thanks for the help!..and happy holidays everyone!

Shaun