Through , larger molecules are formed.

Polymerization.

If you forget what Polymerization is, here: process of when reacting monomer-molecules together in a chemical reaction to make polymer chains or three dimensional networks. There are a lot  of forms for polymerization and different systems exist to categorize them.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."