Camilla and Kevin were debating how waves travel through matter. Kevin said that all waves must travel through some kind of matter. This is why there is no sound in space. Because there is no matter in space (that is called a vacuum). Camilla disagreed with Kevin and argued that while some waves need matter to travel, not all of them do.

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."