Sand Dune Parabola
What shape do you think some sand dunes are in Morocco?
This astonishing photo was taken by the Swedish photographer Fabio Cologna while trekking in Morocco. It seems the wind can occasionally blow the sand into a perfect parabola.
You can read more about these on Sand Dunes (from The Greatest Places) and see more of Fabio’s photos on Morocco Sand Dune (TrekEarth)
Sand Dune in Autograph video
Douglas Butler illustrates using Autograph to test the parabolic nature of this sand dune.
Play with this Autograph file here...
Click the image to load the online Autograph file.
If you have Internet Explorer, Firefox or Safari browsers, you will be able to download the Autograph Player plug-in to explore this file for yourself. Unfortunately this facility is not yet available to MAC users.
Douglas Butler
Jing is a free on-screen recorder that uploads to the web or saves as a Flash file
