. A regional geography of the world, with diagrams and entirely new maps . ould, therefore, expect to find hindrances to naviga-tion in the form of rapids or falls, between Superiorand Huron and between Erie and Ontario. In theformer case we have the rapids of the short MaryRiver, in the latter about 160 feet of the fall is made atthe world-famed Niagara Falls. Compared with theirgreat si/.c these lakes arc very shallow, for their basins,created largely by the scooping and dumping action ofthe ice-sheets of the Great Ice Age, are not very deep. THE DOMINION OF CANADA 375 Indeed, if the wa
. A regional geography of the world, with diagrams and entirely new maps . ould, therefore, expect to find hindrances to naviga-tion in the form of rapids or falls, between Superiorand Huron and between Erie and Ontario. In theformer case we have the rapids of the short MaryRiver, in the latter about 160 feet of the fall is made atthe world-famed Niagara Falls. Compared with theirgreat si/.c these lakes arc very shallow, for their basins,created largely by the scooping and dumping action ofthe ice-sheets of the Great Ice Age, are not very deep. THE DOMINION OF CANADA 375 Indeed, if the water were removed their beds wouldresemble broad plains. The St. Lawrence and the Great Lakes, with theirdependent canals, form a magnificent waterway rightinto the heart of North America. When the canal fromthe Ottawa River to the Georgian Bay lobe of LakeHuron is completed, the routes from the shores ofSuperior, Michigan and Huron to the St. Lawrenceestuary and the open sea will be very much shortened(see Fig. loi). To l/VinnipeqS: FarWesFortWllIiiitn ^^^^^^»*^> ^-^fl^nts THE MAlPA LTD LONDON Fig. ioi.—The Great Lakes and the St. Lawrence. Formerly the greater part of this area was forested,and at first hunting and trapping, and later lumbering,were the principal occupations. To-day, extensive areasare devoted to agricultural occupations of differentkinds, and mining and manufacturing are also im-portant. If the cargoes of boats passing through theSault Ste. Marie or Soo canals (there are three, twoof which are American) were examined, wheat, timberand iron ore would be found to predominate. The grainwould be on its way east from Duluth (), PortArthur and Fort William. The iron ore, which is minedvery extensively on the shores of Lake Superior, would 3/6 NORTH AMERICA be destined to feed the furnaces at Cleveland and Pitts-burg, both of which are near to large supplies of Sudbury, north of Lake Huron, there are richdeposits of nickel and copper. Bet
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgeography, bookyear19
