This melting occurs because the snowflakes gain heat and the surrounding air loses heat. That is option A.
This is the process by which heat energy is transferred from from a surface with a higher temperature to a surface with a lower temperature.
The snowflakes is formed when temperatures are low and there is moisture in the atmosphere in the form of tiny ice crystals.
For snowflakes to melt into liquid form it would gain heat from the surrounding environment, which has a higher temperature, leading to the melting of the snow.
Therefore, melting occurred because the snowflakes gain heat and the surrounding air loses heat.
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