| Term | Definition |
| Central Plains | Eastern part of Interior Plains. ther are lower in elevation and have more rainfall than the Great Plains |
| Great Plains | High, fairly dry plain, the western part of the Interior Plains |
| Great Lakes | A chain of five large freshwater lakes between the northern United States and Canada. They are: Lakes Superior, Michigan, Huron, Erie, and Ontario |
| Interior Plains | The mostly flat land between the Appalachian and Rocky mountains |
| prairie | flat area thickly covered with tall grasses and wildflowers |
| livestock | farm animals such as cattle, pigs, and chickens |
| lake effect | the effect of the Great Lakes on the climate of parts of the Middle West, similar to the effect of oceans on lands near them |
| drought | a period of little or no rain |
| tornado | funnel of wind |
| ore | is a rock that contains a metal such as iron |
| Mesabi Range | where the largest deposits of iron ore was found |
| open pit mining | a method in which huge power shovels are used to dig out ore |
| reclamation | restoring land to its previous state after it has been mined, particularly by open-pit methods |
| Gary, Indiana | steel city |
| Duluth, Minnesota | major port for shipping iron ore |
| skyscrapers | very high buildings |
| Sears Tower | our country's tallest skyscraper |
| North Europe Plain | a low plain that covers thousands of square miles in eastern and central Europe |
| Gdansk | major port in Poland |
| Carpathian | A range of mountains along Poland's southern border |
| Vistula River | a river in Poland that flows 678 miles from the Carpathian Mountains to the Baltic Sea |
| pesticides | chemicals that kill insects that damage crops |
| communist | the government, rather than the citizens make most economic decisions |
| Warsaw | Poland's capital |