Wow, that's quite a big word you have there! Niveo-aeolian deposition is a very fancy way of saying that snow (niveo) and wind (aeolian) work together to leave things on the ground.
When the wind is moving, it can blow snow around and move it from one place to another. Sometimes, the wind can even lift up the snow and carry it through the air. But when the wind stops, the snow falls back down to the ground.
During this falling process, the snow can leave little bits of itself behind on the ground. This can happen if the snow lands on something that's not flat, like a tree or a rock. The snow will stick to the object and not be able to get blown away by the wind.
Over time, more and more snow will accumulate on top of these objects and eventually form a layer. This layer is called niveo-aeolian deposition.
So, niveo-aeolian deposition is really just a bunch of snow that's been stuck to things by the wind. And it's an important process because it helps to shape the landscape of our planet!