Earth Science (All Around the Globe)

Click on the link below to check out my "5-Minute" (90-Minute) presentation on
        HOW WE KNOW THE EARTH IS ROUND:

https://drive.google.com/file/d/1iK7CAf3RtDzVX1INlOPdypeXVxMLP74C/view?usp=sharing

Then please email me Stephen.P.Davis@asu.edu should you have any questions! We need to do a better job learning and explaining all this "basic science" to stop flat-earthers in their 2-dimensional tracks! :)