I think its false look at a map it will say
The answer is - accumulation zone.
The accumulation zone on the glacier is the area that lies above the firn line. It is here where snow accumulates and exceeds the losses form ablation (evaporation, melting and sublimation). The annual glacier equilibrium line separates the accumulation and ablation zone annually.
I believe the answer is movement because the immigrants are moving from one place to another.
Convection is a process which transfers the heat between the temperatures when fluid (i.e. liquid or gas) is in motion. Due to the presence of heat source, water temperature increases and also it will become less dense and rise. Hot air is less dense than cold. When air rises higher in the atmosphere its pressure gets down and it becomes colder.
The answer is C, dense snow. ;)
