Snow and ice cover the Earth's polar regions all year round. (In this data set, snow cover data are available only for the Northern Hemisphere, which is why Antarctica appears green). At mid-latitudes, the extent of snow and ice cover varies as the seasons change. In the fall and winter months (and occasionally into spring) snowstorms lay white carpets of snow across our world's landscapes as sea surface temperatures grow cold enough to freeze lake and sea water. It is important for scientists...
Topics: What -- Polar, What -- Nimbus 7
Source: http://visibleearth.nasa.gov/view_rec.php?id=7763