I am guessing but im not sure i think the answer is humidity
Answer:
The formation of a glacial trough involves two processes abrasion and plucking. Abrasion is when pieces of debris in the glacier wear away at the rocks below, a bit like sandpaper. The sharper rocks in the ice can also cause scratches in the rocks called striations.
Explanation:
P waves is moved by compressing and expanding.
S waves is form perpendicular angle when they pass.
Oxidation
I guess that will help
