North America . « 5i 3j 3i 13 .,SaT>lePt. ,* ^^^--^^^v*^ iL i ^ : 34 15 3t 84 -i 31 /*. <4. Scale of Miles ?•??? ??••<< ? & 4» a 2 2 o Fig. 12.—Delta of the Mississippi. After United States Coast and Geo-detic Survey. THE MARGIN OF THE CONTINENT 55 ments for the sake of improving navigation), and each sub-division of the river is also building- a delta. Each of thefinger-like extensions of the delta, shown on the accom-panying map, is due to the prolongation of a pair of em-bankments into the Gulf by each distributary and thegrowth of a secondary delta at its mouth. Th
North America . « 5i 3j 3i 13 .,SaT>lePt. ,* ^^^--^^^v*^ iL i ^ : 34 15 3t 84 -i 31 /*. <4. Scale of Miles ?•??? ??••<< ? & 4» a 2 2 o Fig. 12.—Delta of the Mississippi. After United States Coast and Geo-detic Survey. THE MARGIN OF THE CONTINENT 55 ments for the sake of improving navigation), and each sub-division of the river is also building- a delta. Each of thefinger-like extensions of the delta, shown on the accom-panying map, is due to the prolongation of a pair of em-bankments into the Gulf by each distributary and thegrowth of a secondary delta at its mouth. The river isthus building a highly compound delta, composed of thesecondary deltas formed at the mouth of each of its dis-tributaries. A conspicuous modification of the otherwisegenerally evenly curved border of the Gulf of Mexico isthus produced, a result that could only be reached in awater body but little disturbed by wind or tidal currents. ESTUARIES AND HARBOURS The features of a coast of greatest importance to civili-zation are its harbours. A coast without harbours is like
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Keywords: ., bookcentury1900, bookdecade1900, bookidnorthamerica, bookyear1904
