When scientists talk about the cryosphere, they mean the places on Earth where water is in its solid form, frozen into ice or snow. Read more ...
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The Circumpolar Arctic Vegetation Map (CAVM) defines the spatial extent of dominant vegetation in terms of the dominant plant growth forms and physiognomy. Mapped vegetation extends south to the treeline, which varies with longitude. Spatial coverage is 60 to 90 N, -180 to 180 W. The map is available in Adobe PDF format, ESRI Arc/Info and Shapefile format, among others.