Describe how glacier is formed

It begins with snowfall in areas where temperatures are low enough for snow to persist year-round. Over time, more snow falls than melts, leading to a buildup.

The weight of the accumulating snow compresses the lower layers. This pressure causes the snowflakes to lose their delicate, feathery structure and become smaller, denser, rounded ice grains called firn.

As more snow and firn accumulate, the pressure increases further. The firn grains begin to melt slightly at their contact points and then refreeze, fusing together. This process, called recrystallization, transforms the firn into solid, dense glacial ice.

Once the ice becomes thick enough (typically tens of meters), the immense pressure causes it to deform and begin flowing downhill or outward under its own weight, forming a glacier.