Mountain glaciers are large masses of ice that form in high mountain ranges where the accumulation of snow exceeds its melting. Over time, the compressed snow transforms into ice, creating slow-moving rivers of ice that flow down valleys. These glaciers are crucial indicators of climate change, as their size and health reflect temperature and precipitation patterns. As they move, mountain glaciers shape the landscape by eroding rock and soil, creating features like U-shaped valleys and moraines. They also serve as vital freshwater sources for many communities, feeding rivers and lakes as they melt during warmer months.