At extreme latitudes, the midnight sun is usually referred to as polar day. That is in Winter.
I think A. Thousands to millions of years
I believe layer D would be composed of material with a plastic nature :)
Rockslides on hills and mountains are created as gravity erodes and deposits rocks. In the desert, the deposition patterns of the wind creates sand dunes. Streams create deltas when they deposit sand and sediment at their mouths, where the water slows to meet the ocean.
