The formation of glaciers

In polar and alpine regions, the climate cold, snow all the year round, when the snow accumulation on the ground, if the temperature dropped to below zero, you can be its own role or the pressure caused by the re-crystallization Snow Grains, known as the firn (firn). When the snow would bring to more deep buried firn, ice crystallization becoming rough, and the density of firn firn due to the existence of particles in the air to reduce the size increased, so has become more dense firn and the formation of blue glacial ice, glacier ice formed, due to its own gravity to form a great Plastomers, slow movement along the slopes or in the ice flows slowly under the pressure of the formation of glaciers. 


Glacier is an open system, the role of glaciers in the under gravity flow. Snow piled up in the way into the glacier system, and changes in the formation of ice, ice in its own weight under the pressure brought by the accumulation of outward flow of ice in the ablation zone by way of evaporation and melting left the system. Ablation in the accumulation rate of speed and balance between the system determines the size of glaciers. 

Glacier before and after can be divided into two parts, or the upper reaches of the latter part of the glacier known as the accumulation zone (zone of accumulation); in the downstream part of the former or the glacier known as the belt (zone of ablation) the dividing line is the snow line, in the the snow line of snow accumulation and ablation volume in the balance.