cordillera - region of parallel mountains, timberline - elevation at which it is too cold for trees, contiguous - "connected to"; sharing a common boundry, Continental Divide - separates rivers that flow east and west, ethanol - fuel made from plants, chinook - warm, dry winds that blow down from Rocky Mnts, irrigation - process by which water is supplied to crops, hydroelectricity - electricity from the power of water, nomadic - always on the move, pueblo - "towns" or "villages" in Spanish, mission - church-based communities, frontier - region beyond or at the edge of a settled area, Manifest Destiny - belief that the U.S. had a right to extend its boundaries to the Pacific Ocean, annex - to take control of, reservation - lands set aside for someone, Homestead Act - gave away western lands to people who were willing to move there to farm, Mormon - member of the Church of Jesus Christ of Latter Day Saints, Dust Bowl - the southern Great Plains during the severe drought of the 1930s, topsoil - the fertile soil that crops depend on to grow, agribusiness - firms that rely on machines and technology and mass-production methods to farm large areas, aerospace - industry that makes vehicles for air travel, tourism - industry that provides services to people who are traveling, service industry - business that provides services (not goods),

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