Glaciers exist in extremely cold places. The Antarctic and Arctic on the Earth are cold all year round. In other regions, only high altitude mountains can form glaciers. We know that the lower the temperature is, the higher the altitude is, the higher the altitude will be, the lower the temperature will be below 0°C. This altitude is what glaciologists call a snow line.
In Greenland in the Antarctic and Arctic Circles, glaciers are developed on a continent, so they are called continental glaciers. In other areas, glaciers can only develop in the mountains, so the glaciers are called mountain glaciers.
In the high mountains, the glaciers can develop. In addition to requiring a certain altitude, it is also required that the mountains should not be too steep. If the mountain peak is too steep, the falling snow will slide downhill and it will not form snow. It will not form glaciers.
As soon as the snow falls on the ground, it will change. With the change of external conditions and time, the snow will turn into a spherical snow that completely loses its crystal characteristics, called snow, which is the “raw material†of the glaciers.
After the snow turns into snow, the hardness of the snow and the tightness between them increase with time, and the snow particles, large and small, are pressed against each other, tightly embedded together, and the pores are continuously narrowed. As a result, the brightness and transparency of the snow layer gradually weakened, and some air was trapped inside. Glacial ice thus formed. Glacial ice was originally milky white, and after a long period of time, the glacial ice became denser and harder, and the bubbles inside it gradually decreased, gradually turning into crystal clear blue ice crystal old glacial ice.
Glacier ice flows slowly down a hillside under gravity (of course, the flow is very slow), forming a glaciers.
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