Answer:
Have been mechanical weathering to prevail.
A chilly, humid atmosphere at high altitude, where freezing and thawing are prevalent.
An uplifting dry cold atmosphere wherein material is eliminated out of an inherent pluton / intrusive igneous rock by erosion.
Weathering of chemicals would prevail.
A warm atmosphere with several brief but intense rain storms. A warm and humid atmosphere with intense rainfall that happens all year round.
A warm and wet atmosphere with annual precipitation above normal and many turbulent seasons annually.