Bok
11-18-2017, 11:58 AM
This image from NASA's Mars Reconnaisance Orbiter (MRO) shows one possible place where sand grains are being produced on Mars today.
More... (http://www.nasa.gov/image-feature/jpl/pia22043/where-does-the-sand-come-from)
More... (http://www.nasa.gov/image-feature/jpl/pia22043/where-does-the-sand-come-from)