How to draw a cross section. Headphone users beware, turn down the volume

This is a lesson I did for my class today. I used explain everything and recorded my lesson. (Thus the questions directed to my students) I have edited it so it does not go for too long. However, you may wish to pause the video at different times to catch up. If you get it, pick some other points on the map and practice another one or two cross sections. I hope it helps.