What is the relationship between half-life (radiometric dating) ad the absolute age of an object?

The radiometric dating is used to determine the absolute age of rocks. There are  unstable isotope elements that decay over time into stable elements. For those whose half-life is known it can be used to calculate the age based on the ration of the amount of the unstable elements and the number of stable atoms (that are products of the radioactivity) in the rocks.

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.