How did the invention of the steel plow and windmills encourage the expansion of agricultural production in the central United States?
What will be an ideal response?
The invention of the steel plow in the 1840s allowed farmers to plow heavy prairie soils that previously were unfarmable. Windmills have the potential to provide millions of dollars to farmers and rural landowners.
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Environmental groups for secondary and postsecondary (college) students help participants
A. Develop their organizational skills B. Become ecologists C. Come together to multiply the efforts of people with the same goals and ideals D. Learn how to become effective radical environmentalists E. Come together to multiply the efforts of people with the same goals and ideals, and also help them develop their organizational skills
During the afternoon the greatest temperature difference between the surface air and the air
several meters above occurs on a: a. clear, calm afternoon. b. clear, windy afternoon. c. cloudy, calm afternoon. d. cloudy, windy afternoon.
What areas of the world have the highest fertility levels?
A) Africa and much of the Muslim world B) Australia and Eastern Europe C) South America and the Caribbean D) North America and Japan E) Russia and surrounding countries (the former Soviet Union)
A solar cooker is an example of ________
A) passive solar technology B) concentrated solar power C) a hydrogen fuel cell D) OTEC technology E) active solar technology