Answer:
- Physiographic Divisions, Natural Resources, and Economic Development of North America
1. Canadian Shield (Laurentian Plateau):
- Geomorphology: Residual plateau formed of Pre-Cambrian hard igneous-metamorphic rocks, Laurentian Mountains, Hudson coastal swampy lowlands, and Arctic cold desert in the north.
- Resources: St. Lawrence River, Great Lakes, coniferous Taiga forest; nickel in Sudbury, hematite iron ore in Mesabi and Labrador, gold in Timmins, and uranium in Athabasca.
- Economic Development: Sudbury (nickel smelting), Montreal and Quebec (paper, pulp, aviation), and Thunder Bay (grain and ore port).
2. Appalachian Highlands:
- Geomorphology: Ancient folded residual mountains (Blue Ridge, Mount Mitchell - 2,037 m), Allegheny-Cumberland plateau, Piedmont plain, and Fall Line.
- Resources: Hudson, Tennessee (TVA) rivers; anthracite in Pennsylvania and bituminous coal in West Virginia; tobacco, fruit, and dairy farming.
- Economic Development: Pittsburgh (world steel capital), Birmingham (iron and steel), and the New York-Philadelphia corridor (chemicals, heavy machinery, and finance).
3. Central Lowlands (Great Plains):
- Geomorphology: Flat sedimentary plain of the Mississippi-Missouri basin, Black Hills, Edwards Plateau, and western semi-arid steppe region.
- Resources: Mississippi-Missouri waterway; prairie (chernozem) soil supporting wheat, corn, and cotton belts alongside pastoral ranching; shale oil, gas, and tar sands in the Permian Basin and Alberta.
- Economic Development: Chicago (meat processing and agricultural trade), Houston (petrochemicals and oil refining), and Dallas (aviation and oil industry).
4. Western Cordillera:
- Geomorphology: Young folded Rocky Mountains (Mount Elbert - 4,401 m), Alaska Range (Denali - 6,190 m), Cascades, Sierra Nevada; Columbia-Colorado plateau; California Valley; Great Basin, Sonoran, and Mojave (Death Valley: -86 m) deserts.
- Resources: Columbia and Colorado rivers (Hoover Dam); copper, gold, silver, and lithium in Bingham; Mediterranean citrus fruits, grapes, and Douglas fir forests.
- Economic Development: Silicon Valley (semiconductors and IT), Los Angeles (cinema and petrochemicals), Seattle (Boeing aviation industry), and Vancouver (commercial port).
⇒ This intricate geomorphological structure of North America establishes the regional foundation for mineral, energy, and agricultural resources, where the integration of inland waterways and advanced infrastructure has positioned the continent as a unified global economic powerhouse.
