Glaciers

Glacier
A glacier is a thick mass of ice that originates on land by accumulation, compaction and recrystallization of snow, showing evidence of flow in the past or at present. Their existence is possible when the annual snowfall exceeds summer evaporated, so most are in areas near the poles, although there are other areas in mountains. The process of glacier growth and establishment is calledglaciation. The world's glaciers are varied and can be classified according to their shape (valley, niche Icefield etc.) Climate regime (tropical, temperate or polar) or thermal conditions (base cold, hot or politermal basis).
10% of the Earth is covered by glaciers, and in recent geological times that percentage rose to 30%. Accumulate world's glaciers over 75% of freshwater mundo.En currently 91%of the volume and 84% of the area this total glaciers in Antarctica, 8% by volume and 14% of the area in Greenland adding the remaining 4% of the glaciers and less than 1% of the volume.
Training
Glaciers are climate product are permanently exchanging mass and other parts of the system with glacial hidrológico.Los grow with the addition of other types of snow and ice melt and lose mass in waterice and dismemberment of hielo.La detémpanos difference between gains and losses from a glacier mass balance masa.Cuando called mass balance is negative and the glacier loses mass when positive gains mass adding creciendo.4 A mass of a glacier is llamaacumulación ablation and loss.
The main forms of accumulation are direct precipitation of snow, freezing of liquid water, snow carried by winds,snow and ice brought by avalanches, cencelladas and freezing of water in glaciers basales.En layers usually draw an imaginary line called equilibrium line which dividide the glacier in question into two zones, one of accumulation and ablation in net terms.
Icing glacier
In places of a glacier where snow accumulation is greater than ablation snow accumulates from year to year and the deeper layersof snow are transformed into glacial ice. The transformation in glacier ice is due to one of two processes and other metamorphic compaction. The processing speed depends on the humidity and temperature. The snow crystals that precipitate on a glacier have shapes ranging from hexagons and needles to more complicated, but these forms are unstable to build either a glacier or elsewhere. andevaporated in high exposure areas and are more sheltered condensation, which eventually make them look rounder. Before becoming glacial ice snow enneviza becomes, essentially snow that has survived at least one year.
In glaciers, where the fusion occurs in the area of ​​snow accumulation, snow can turn to ice through melting and refreezing (in periods of several years). In Antarctica, where the fusion isvery slow or does not exist (even in summer), compacting the snow that turns into ice can take thousands of years. The enormous pressure on the ice crystals makes them have a plastic deformation, whose behavior causes glaciers move slowly under the force of the gravedadcomo if it were a huge earthflow.

Mario Alberto Rodriguez Turrubirtes
Glacier
A glacier is a thick mass of ice thatoriginates on land by accumulation, compaction and recrystallization of snow, showing evidence of flow in the past or at present. Their existence is possible when the annual snowfall exceeds summer evaporated, so most are in areas near the poles, although there are other areas in mountains. The process of glacier growth and establishment is called glaciation. The world's glaciers are varied and can beclassified according to their shape (valley, niche Icefield etc.) Climate regime (tropical, temperate or polar) or thermal conditions (base cold, hot or politermal basis).
10% of the Earth is covered by glaciers, and in recent geological times that percentage rose to 30%. Accumulate world's glaciers over 75% of freshwater mundo.En currently 91% of the volume and 84% of the area this total glaciers...