Saharan dust off Portugal
This is a plume of dust swirling into the Atlantic Ocean as imaged by the MODIS on NASA’s Terra satellite on April 6, 2011. You can also see a phytoplankton bloom in this photo. While dust can cause major havoc, it also has life-giving qualities. Dust carries iron, which fertilizes the world’s oceans; when waters are “iron-poor,” phytoplankton can proliferate.