Glaciers in New York cause a layering of each year's snow on top of all the previous years' snow. Over many years, this layering can build up to great depths. The effect is that a glacier's weight, combined with its gradual movement, can drastically reshape the landscape over hundreds or even thousands of years. The ice erodes the land surface and carries the broken rocks and soil debris far from their original places, resulting in some interesting glacial landforms.