How often do glaciers form?

Glaciers form under specific conditions where snowfall exceeds melting over extended periods, typically in regions with cold temperatures and sufficient moisture. This process can take thousands of years, as layers of snow compress and transform into ice. Glaciers are more likely to form in polar regions and high mountain ranges, but their formation is influenced by climate changes and local environmental factors. Overall, while glaciers can form at various times and places, the process is gradual and varies widely depending on geographic and climatic conditions.