What factors account for the Corn Belt's decline in agricultural production during the past two decades, especially as compared to the region's tertiary and quaternary sectors?
What will be an ideal response?
The number of farms in the region and the amount of land in cultivation has declined during the 20th century. Farms have gotten larger and now use less labor per acre. These changes are a result of competition that keeps prices for commodities low. Less fertile lands can't produce as profitably and so are converted for other uses.
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The majority of the energy consumed in the world today comes from nonrenewable sources
Indicate whether this statement is true or false.
Consider the scenario in which the minimum temperature drops to 1ºC on a clear night, and fog forms early in the evening the next night. Which of the following describes why it is likely that the minimum temperature will not be as low on the second night?
A. calm winds that accompany fog B. enhancement of the greenhouse effect by the fog cloud C. trapping of smoke and dust by the water vapour D. increased reflection of solar radiation by fog
A caldera similar to this one filled with water to become Crater Lake in Oregon (42°56'42"N, 122°06'01"W; see Figure 35-2). Why isn’t the Okmok Caldera presently filled with water?
The question is based on Map T-2, the “Umnak, Alaska,” topographic map (scale 1:250,000; contour interval 200 feet), Map T-21b, a satellite image; and Figures 35-3 and 35-4, a shaded relief map and a stereogram showing the Okmok Caldera (53°25'33"N, 168°07'38"W) on Umnak Island in the Aleutian Islands. What will be an ideal response?
Which farming practice(s) reduce(s) soil erosion?
A. planting cover crops B. contour farming and terracing C. planting wind breaks D. planting wind breaks, contour farming and terracing, and planting cover crops