If you haven't seen this 5-minute Vimeo gem, I first talked about it here. Go there and watch it.
I developed a mini-lesson to accompany the video so as to create what would now be called a flipped-classroom lesson. Of course, I shared!
But I wasn't happy with how that turned out. So I reworked it a little bit. The rework makes things the student work aspect more visual-spatial.
YouTube Geophysics: Amazing Views of Earth on Vimeo