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| | Oklahoma - Encyclopedia, History, Geography and Biography |
 | | Oklahoma is a state in the United States, lying mostly in the Southern Great Plains. |
 | | These ecoregions are: Western high plains, Southwestern Tablelands, Central Great Plains,Tall Grass Prairie, Cross Timbers, Caves and Prairie, Ozark Highlands, Ozark Forest, Hardwood Forest, Ouachita Mountains, and Cypress Swamps and Forests. |
 | | Oklahoma has some of the strongest thunderstorms in the entire world, because of the cold and warm airmasses colliding east of the Rocky Mountains, making the state the heart of Tornado Alley. |
| www.arikah.net /encyclopedia/Oklahoma (3751 words) |
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