. Elementary physical geography;. level or a gently rolling surface, sloping toward theMississippi River — the whole declining gently from theHeights of the Land, to Hudson Bay on the north andthe Gulf of Mexico on the south. Most of the rivers flow in channels that are from onehundred to three hundred feet lower than the general levelof the land, and their high banks are the bluffs of this re-gion. For the greater part, the bluffs are from two to tenmiles apart, and there is a very level flood-plain betweenthem—the famous bottom lands. All through the 360 PHYSICAL GEOGRAPHY Great Central Plai
. Elementary physical geography;. level or a gently rolling surface, sloping toward theMississippi River — the whole declining gently from theHeights of the Land, to Hudson Bay on the north andthe Gulf of Mexico on the south. Most of the rivers flow in channels that are from onehundred to three hundred feet lower than the general levelof the land, and their high banks are the bluffs of this re-gion. For the greater part, the bluffs are from two to tenmiles apart, and there is a very level flood-plain betweenthem—the famous bottom lands. All through the 360 PHYSICAL GEOGRAPHY Great Central Plain the soil is naturally very fertile; thatof the bottom lands is especially productive. The level surface and the general conditions of topog-raphy make this region one of sameness so far as externalappearance is concerned. Climatic conditions, however,make two separate and distinct areas of history and indus-try; therefore it is divided into Northern states and Southernstates. The two groups are roughly separated by a bound-. A MODERN HARVESTERIt could not be used in a rugged country. ary which practically separates the cotton region from thatof food production and manufacture. In the Northern states wheat, corn, oats, and grass havealways been the chief products. Because of the level sur-face and the deep, nutritious soil the grain crops can beboth planted and harvested at the minimum of no other conditions of topography could there have INDUSTRIAL REGIONS OF UNITED STATES 361 been such a wonderful development of planting and har-vesting machinery. As a result, this region has becomeone of the principal food-producing regions of the produces one-fourth of the worlds crop of wheat, a con-siderable proportion of the dairy products, and about three-fourths of the corn. Moreover, the productiveness of theland is due very largely to the character of the glacial driftspread over the surface. The western part of this region—the part beyond the2,000-foot
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