Glacier formation is a slow process that occurs over a long period of time, usually several decades or even centuries. It happens in regions of high altitude and cold temperatures, where snowfall is abundant, and the snow accumulation exceeds the amount that melts during the summer months.
The process begins with snowfall or precipitation in the form of snow, which accumulates over time to form a layer called a snowpack. The snowpack then compresses under its own weight, and the bottom layer, known as firn, begins to crystallize and become denser.
Over time, the weight of the snow and ice on top of the firn causes it to recrystallize into solid ice, continuing to increase the density of the glacier. As a glacier moves, the ice at the bottom is constantly melting and refreezing, which can cause the glaciers shape to change over time.
Glaciers can form in many places around the world, including polar regions, high-altitude mountains, and even in some far-north regions at lower elevations.
TAG：
英语 |
英语学习文章链接：https://english.9educ.com/enxx/177201.html
