All i can tell you is a lot! Probably tons of snow is needed. Glaciers are frozen water and ice. They are very big in size. They continuously move but they move at a slow pace. It takes a very long time for them to form. Also many glaciers are fresh water. Hoped this helped you!! I also threw in some fun facts there! lol
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When new snow is added to a glacier faster than the rate at which ice and snow melt, the glacier gets larger because the accumulation of new snow exceeds the loss from melting. This process contributes to glacier growth and expansion.
A growing glacier accumulates more snow and ice each year, leading to overall glacier advancement. In contrast, a melting glacier loses more ice and snow than it gains, resulting in glacier retreat.
Snowfall contributes to the growth of glaciers by adding layers of snow that compress into ice over time. Glaciers are sustained by a balance between snow accumulation and ice melting. Increased snowfall can lead to larger glaciers, while decreased snowfall can result in glacier retreat.
A boulder left behind by a retreating glacier is known as an erratic. A glacier is a moving river of ice and snow.
The area of a glacier where losses of ice exceed the addition of snow is called the ablation zone. In this zone, melting, sublimation, and iceberg calving typically occur at a higher rate than snow accumulation. This can lead to glacier retreat and overall shrinking of the glacier.