Which of the following methods tells you which layer of rock is oldest but does not tell you exactly how old

The method that tells you which layer is the oldest is using relative age, with this you can analyze the rock and know that they deepest one is the oldest. This answer does not have the actual method name due to the fact i cannot remember.

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."