A glacier is ice, which melts just above 0 Celsius or 32 Fahrenheit.
Ice cube melts but the glacier does not melt because depending upon the temperature of the surrounding. When an ice cube is taken out of the refrigerator, there is a sudden change in the temperature of the surrounding as it (temperature) increases so the ice cube depending upon the temperate of the surroundings melts earlier. According to the latent heat of fusion, it will first melt completely to become liquid and then its temperature will increase to reach a state of thermal equilibrium e of the room temperature. In case of a glacier, the temperature of its surroundings is less so a glacier does not melt like ice cube.
It depends on conditions. A long period of above-average warm and dry weather can cause a glacier to shrink. As the ice gets thinner, the warm meltwater and increased exposure to rocks (which absorb sun energy) quickens the pace at which the glacier recedes.
They melt and then slide
Snow along a broad plateau does not melt, but compacts into a glacier.
Two conditions necessary for the formation of a glacier are cold temperatures that allow snow to accumulate and not melt, and a consistent source of snowfall to replenish the glacier's mass. These conditions allow the snow to compress and eventually turn into ice, forming a glacier over time.
The water melting from a glacier is called the glacier melt. This water often supplies the water for some of the great rivers of the world, like the Ganges and the Yangtsee.
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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.
Cold wet conditions for a glacier to form
Melt water
What can happen when the glacier melts in a cirque
Cold wet weather is needed for a glacier to form