I think u have to learn the basic steps
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.
The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. From Earth's perspective, we see varying amounts of the illuminated part of the Moon.
Natural gas was the largest source—about 40%—of U.S. electricity generation in 2020. Natural gas is used in steam turbines and gas turbines to generate electricity. Coal was the third-largest energy source for U.S. electricity generation
