What is the Meaning & Definition of glacier

Within the hydrology of the planet Earth we found the water in various forms and structures. Among them, the glacier is without a doubt one of the most striking. We mean by glacier to those structures composed of large layers of ice (in most cases permanent) are the result of water that has been frozen by action of the cold and the temperature. The glaciers are nothing more than water compacted, crystallized and frozen in large masses and quantity, becoming large icy areas in which man can not obviously inhabit due to extreme weather conditions. While most of the planet Earth is covered by water, a portion of this amount is represented by glaciers, masses of frozen water that can reach important extensions and heights. The glaciers make up from a very long process of accumulation of snow and water snow in different layers of height. A part of the snow that is formed in low temperature seasons melts when it comes up, but in cases where the melt is less than the generation of snow begins to accumulate, condense and transform itself from the pressure which generate layers superimposed on more compact and hard ice element of the glaciers.
The planet has important and beautiful glaciers generally located near mountain areas and low temperature at the Poles, in the heights of the mountains, etc. However, today, many of them have lost its splendor, its extension and its power due to the advance of increasingly stronger from the process known as climate change involved the retention of greenhouse gases within the Earth's atmosphere and the consequent increase of temperature.
Article contributed by the team of collaborators.