Vanuatu's Lopevi Volcano released a plume on May 3, 2007. The same day, the Moderate Resolution Imaging Spectroradiometer modis.gsfc.nasa.gov (MODIS) on NASA's aqua.nasa.gov Aqua satellite captured this image of the plume and its larger consequences. The U.S. Air Force Weather Agency reported an extensive area ofresulting from the volcanic eruption. When gases from a volcano -- particularly sulfur dioxide -- react with oxygen, water, dust, and sunlight, volcanic smog (or vog) results.