a dry wind that sometimes blows over the Great Plains in winter

the fertile soil that crops depend on to grow

the process of collecting water and using it to water crops

yearly

to reduce in number

important

to make

an imaginary line through the Rocky Mountains that separates rivers that flow west from rivers that flow east

a park that has been set aside for the public to enjoy for its great natural beauty

a member of the Church of Jesus Christ of Latter Day Saints

the southern Great Plains during the severe drought of the 1930s

the elevation above which it is too cold for trees to grow

joined together inside a common boundary

an industry based on huge farms that rely on machines and mass-production methods

the industry that makes vehicles that travel in the air and in outer space