You deserve more upvotes for doing this! Thanks for the information! Slightly technical and fast paced, but no need to coddle your audience IMO :) It's interesting to hear about wind direction. I always presume prevailing westerlies where I live in Colorado Springs, but I thought the dunes were on the east side of the Rockies where I live. So I had presumed the dunes mainly needed easterly winds to not have been spread out all over eastern Colorado. I was also fascinated to hear of the sand composition. I had presumed a lot of it was from erosion of the Cristos, but there was also an ancient lake.
Thank you for your lecture. I need to convey it in my own language (Danish). Can one, simply put, explain that the Great Sand Dunes were formed by sand from the now dried up Lake Alamosa, which once held on to the sand that came from the mountains and is now maintained by volcanic particles (or is it called sand?)? Is the sand from the San Juan Mountains an expression of the Venturi effect. Thank you
