. Elementary physical geography . Greenland and valley glaciers, the front margin of the icewas a place of wastage, atwhich much material wasaccumulated in the formof a terminal of the most distinctterminal moraines formedby the glacier of theUnited States, follows the Boulder in the moraine at Cape Ann, Mass. , ., heavily shaded line on themap (Fig. 185). Other moraines are found north of this,marking stages of halting during the retreat of the ice. Both in Europe and America, the glacier has produced avery pronounced effect upon the topography and the condi-tions of the land surf
. Elementary physical geography . Greenland and valley glaciers, the front margin of the icewas a place of wastage, atwhich much material wasaccumulated in the formof a terminal of the most distinctterminal moraines formedby the glacier of theUnited States, follows the Boulder in the moraine at Cape Ann, Mass. , ., heavily shaded line on themap (Fig. 185). Other moraines are found north of this,marking stages of halting during the retreat of the ice. Both in Europe and America, the glacier has produced avery pronounced effect upon the topography and the condi-tions of the land surface. There are many details which itwould be impossible to consider in a work of this kind; butsome of the more pronounced features may be terminal moraine is one of the most striking topo-graphic forms resulting from glacial action. The topographyis extraordinarily rough and irregular. There are hills andhummocks, enclosing valleys and pits, and all are throwntogether in the most confused manner. The material com-. GLACIERS. 321 posing them is partly clay, partly gravel; and fragments ofall sizes, from tiny bits of clay to large boulders (Fig. 186),are confusedly thrown together. Sometimes the surface of
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