The international geography . very minute sand is be-lieved to be the origin of the peculiar earthy deposit known as loess, whichoccurs on the borders of the Alps, in the Mississippi valley, and to a re-markable extent in northern China, where it completely conceals all otherformations. Another accumulation common in tropical countries is a stiffred clay called laterite, the result of the weathering of igneous rocks. Afourth and very important accumulation is the boulder clay or diluvium leftby ice sheets or in extra-glacial lakes. Large tracts of the low ground ofnorthern Europe (Fig. 52) and
The international geography . very minute sand is be-lieved to be the origin of the peculiar earthy deposit known as loess, whichoccurs on the borders of the Alps, in the Mississippi valley, and to a re-markable extent in northern China, where it completely conceals all otherformations. Another accumulation common in tropical countries is a stiffred clay called laterite, the result of the weathering of igneous rocks. Afourth and very important accumulation is the boulder clay or diluvium leftby ice sheets or in extra-glacial lakes. Large tracts of the low ground ofnorthern Europe (Fig. 52) and America (Fig. 329) are covered with thisclay, which has had the effect of greatly changing the surface, causingthe formation of innumerable lakes and associated river systems whichhave not yet had time to drain the basins or to entrench themselves deeplyin the land. The Geographical Cycle.—Professor W. M. Davis has formulatedthe geographical results of erosion and crustal movement in a theory 58 The International Geography. COHSTRUcr;o^^, SHORE LINE Fig. 34.—Cycle 0/ Erosion. 1.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeography, bookyear19
