Solution:

• A glacier is a persistent body of dense ice that is constantly moving under its own weight.
• A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries.
• Glaciers slowly deform and flow under stresses induced by their weight, creating crevasses, seracs, and other distinguishing features.
• They also abrade rock and debris from their substrate to create landforms such as cirques, moraines, or fjords.
• Glaciers form only on land and are distinct from the much thinner sea ice and lake ice that forms on the surface of bodies of water.