| A | B |
|---|
| COASTAL PLAIN | ALONG THE ATLANTIC OCEAN AND THE GULF OF MEXICO-- LOWLAND, EXCELLENT HARBORS |
| APPALACHIAN MOUNTAINS | OLD ERODED MTNS. IN THE EASTERN U.S. |
| CANADIAN SHIELD | HORSESHOE-SHAPED REGION WRAPPED AROUND THE HUDSON BAY IN CANADA |
| INTERIOR LOWLANDS | BETWEEN THE APPALACHIAN MTNS. AND GREAT PLAINS-GRASSY FLATLANDS-MANY RIVERS |
| GREAT PLAINS | BETWEEN INTERIOR LOWLANDS AND THE ROCKY MTNS.-FLAT-ELEVATION RISES AS YOU GO WEST |
| ROCKY MOUNTAINS | HIGH RUGGED MNTS, CONTINENTAL DIVIDE |
| BASIN AND RANGE | BETWEEN THE ROCKY MTNS. AND THE SIERRA NEVADAS AND CASCADES |
| COASTAL RANGE | RUGGED MOUNTAINS ALONG THE PACIFIC COAST--FERTILE VALLEYS |
