"Glacial Script" Glaciers which formed all over land the northern 1/3 of the N. Hem. Continents during the ice age are moving mass's of ice. They occur when the rate of snowfall exceed[s] the rate at which it melts. Compaction of the snow as it is buried turns to ice & when ice becomes thick enough it flows. As glaciers flow they grind and pluck away at the bed rocks over which or which they lie dam up streams and create and create other features which we shall look at during in the slide during next few minutes. Today most glaciers are of a type in more accessible areas of world occur in mt ranges with cold climate than an actual mountain glacier. So during the you yes Ice Age however great areas of continents were covered by ice sheets which created all of other features. Today Continental ice sheets such as this we found only in Greenland & Arct. Islands & Antarctica. They have left behind unmistakable signs of their former presence & signs which can be readily recognized by me if I know what to look for and it is some of these that we will attempt to show you in this presentation.