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Glaciers - National Snow and Ice Data Center Glaciers begin to form when snow remains in the same area year round, where enough snow accumulates to transform into ice Each year, new layers of snow bury and compress the previous layers This compression forces the snow to recrystallize, initially forming grains similar to the size and shape of sugar grains
Glacier Quick Facts | National Snow and Ice Data Center What is a glacier? A glacier is an accumulation of ice and snow that slowly flows over land Alpine glaciers are frozen rivers of ice, slowly flowing under their own weight down mountainsides and into valleys Ice sheets exist only on Greenland and Antarctica, and they spread out in broad domes in multiple directions
Science of Glaciers | National Snow and Ice Data Center These types of glaciers tend to surge periodically, while most glaciers never exhibit surges Components of a glacier Glaciers are dynamic, and several elements contribute to glacier formation and growth Snow falls in the accumulation area, usually the part of the glacier with the highest elevation, adding to the glacier's mass
Learn - National Snow and Ice Data Center Glaciers Two categories of glaciers exist: ice sheets and alpine glaciers Ice sheets cover vast areas of land in broad domes Alpine glaciers, are smaller, and found not only at the poles, but in high mountain regions across the globe
Why Glaciers Matter | National Snow and Ice Data Center Glaciers also impact sea level The cryosphere consists of all the places on Earth where water is frozen, including snow, sea ice, ice sheets, and glaciers Though glaciers and ice caps account for only 0 5 percent of total land ice, their contribution to sea level rise during the last century exceeded that of the ice sheets
Google Earth Activities - National Snow and Ice Data Center Largest glaciers Google Earth screenshot — Credit: NSIDC Largest Glaciers and Glacier Complexes in the World Tour the globe to view outlines of the three largest glaciers and glacier complexes in each of the 19 glacial regions of the world as defined by the Global Terrestrial Network for Glaciers Download: Largest Glaciers and Glacier Complexes (KMZ) Data Source: Largest Glaciers and
Homepage | National Snow and Ice Data Center Glaciers are huge masses of ice, snow, rock, sediment, and often liquid water that originate on land and move down slope under the influence of their own weight and gravity The two main types are continental glaciers (or ice sheets) and alpine glaciers
Data set update: GLIMS Glacier Database, Version 1 Additional changes include reclassifying some glaciers as extinct, and updating some rock outcrops in the northeast Antarctic Peninsula to glacier outlines You can find more detailed information about these changes in the GLIMS Glacier Database V1 Change Log, which is located in the General Resources section on the data set's landing page