Glacier is a large, slow-moving mass of ice that forms on land. It is made from layers of snow that have built up and compacted over time. Glaciers move slowly across the ground and can cover large areas. They are made of frozen freshwater.

Glaciers are found in polar regions and high mountains, including Antarctica, Greenland, and parts of North America, Europe, and Asia. They formed over thousands of years during long periods of cold climate. Glaciers shape the land around them and are part of cold-region ecosystems.