The right option is; a. soil degradation
Soil degradation most plausibly accounts for the reduction in corn yield.
Soil degradation is an environmental problem in which the condition or quality of soil is reduced due to its improper use usually for agricultural or industrial purposes. Soil degradation can reduce the physical, chemical and biological quality of soil. Soil degradation results in loss of organic matter, soil contamination, fertility decline, and soil acidity or alkalinity which can greatly affect agricultural productivity.
The corn belt is an example of an area that is found in mid western part of United States.
Explanation:
The corn belt came into existence since the year 1850, it was dominated by the production of corns. This word is mainly used by US that includes Indiana, lowa, ohio,illinois, South Dakota,Minnesota, Nebrasaka,Missouri, as well as Kanas.These states were usually capitalized.
Corn belt is considered to be an important belt because this belt helps in agriculture purpose. This belt produces corns as well as soyabeans. Alfaalfa as well as winter wheat are two important crops.
<span>The best answer is (d) water from snowmelts. The American Southwest has many mountains that catch moist air moving westward (from the Pacific) that falls as snow during the winter. The snow melts gradually during the spring and summer when there is little precipitation. The melted snow runs off the mountains into rivers and streams that can be tapped by irrigation pumps. The snowmelt also sinks into the ground, replenishing underground aquifers that can be tapped by wells in the valleys where farming takes place.</span>
