1348-4580 - Desert Erg Iguidi, Algeria, True Colour Satellite Image. True colour satellite image of Erg Iguidi, a sand desert between Algeria and Mauritania. The 250m wide dunes lay in the South on a sand plain, and in the North on a blakek sandstone area. The light blue areas are calcareous and salt crusts left out from the evaporation of the oueds' water. Image taken on 29 March 1987 using LANDSAT data.
860-290088 - Scuba diver under ice in a halocline cloud, a subtype of chemocline caused by a strong, vertical salinity gradient within a body of water. Arctic circle Dive Center, White Sea, Karelia, northern Russia