North Polar Sand Dunes

Sand dunes near Mars' north pole which change with the seasons. Occupy a ring around the north polar regions.

North Polar Sand Dunes Shift With Seasons (Feb 11)

 * See North Polar Sand Dunes


 * http://www.bbc.co.uk/news/science-environment-12365082
 * http://www.dailymail.co.uk/sciencetech/article-1353721/Red-Planet-How-winds-change-shifted-sands-time-Mars.html?ito=feeds-newsxml
 * http://www.wired.com/wiredscience/2011/02/mars-shifty-sand-dunes/
 * http://www.pbs.org/newshour/rundown/2011/02/on-mars-shifting-sand-dunes-surprise-scientists.html
 * http://www.jpl.nasa.gov/news/news.cfm?release=2011-039
 * http://www.space.com/10755-mars-sand-dunes-change-quickly.html
 * http://news.discovery.com/space/mars-surface-ice-changes-110203.html