Outside my house, there is a gap visible below some of my windows. I have attached pictures to make it clear, since I don't know the terminology.
The gap is about the width of my thumb. I can see the insulation easily.
Should I fill this, and if so, how?
Gallery link: http://imgur.com/a/P3Sl6
Note: this question is different from my other question I recently asked here. This is specifically dealing with the windows, whereas the other question simply involves some decorative trim.