A very highly effective form of erosion is the glacier itself, forming at the highest elevation the place ice and snow will not soften because of the low temperatures. Eventually the glacier moves downhill underneath the pressure of gravity and its own immense weight. Movement of glaciers can carve valleys, ridges and other rock features and even form lakes if melted. These touring glaciers may be so powerful that they might decide up massive boulders and carry them downhill, depositing…