Read this article to learn of the creation and importance of glaciers. Glaciers exist in all parts of the world. They are formed when temperatures are right, but they also need a certain kind of atmosphere and precipitation. Certain areas of the world contain dry ground or tundra instead of glaciers, because precipitation and climate are not correct. Since hot summers also melt a glacier, glaciers tend to form in places where the temperature is the same all year round.
Glaciers form in areas where the temperature dips below zero.
They are formed from large layers of snow pressing down. The weight of snow produces thick ice beneath itself, and this is the start of a glacier. These grains increase in size, pushing air from underneath the snow. Lack of air is what makes the surface and inside of a glacier so dense. Often, when glaciers reach a mass of more than 15 meters, they begin to move due to their size and the weight of gravity.