New PDF release: Classification of the Animal Kingdom

By Richard E. Blackwelder

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Some 230 million acres (93 million hectares) of cropland required constant supervision to control erosion caused by wind and water. 34 Soil Conservation An abandoned farmstead in the Dust Bowl of Oklahoma in 1937 shows the effects of wind erosion. USDA Photo Dust storms are the evidence of wind erosion. Soil unprotected by plant cover simply blows away. S. farmlands were badly damaged by wind. Many fields lost from 2 to 12 inches (5 to 30 centimeters) of vital topsoil during this period. As a result, the 35 Protecting the Environment entire southern Great Plains area was called the Dust Bowl.

S. Air Force insect. Tropical exotic lizards introduced into southern Florida have established populations that outcompete or prey on native species. Numbers of native lizards have declined noticeably, especially in areas where natural habitat has been replaced by houses and other man-made structures. 48 Wildlife Conservation The United States Geological Survey has a Web page describing the problems caused by the brown tree snake. After the species was accidentally introduced to Guam in the mid-20th century, it colonized the island and preyed relentlessly on native species, causing the decline, local elimination, or extinction of several species of birds, fruit bats, and lizards.

On long slopes a low ridge, or terrace, thrown along the outer side of the slope catches soil and rainwater and retards runoff. Encouraging plant growth on a terrace will help hold soil. In dry regions a lister plow can be used to throw a ridge of dirt to each side, creating a trough about 18 inches (46 centimeters) wide and 7 inches (18 centimeters) deep. Crops are planted in the bottom of the trough. 41 Protecting the Environment Trees line a wheat field. Planting trees near farmland creates a shield that protects crops and topsoil from the effects of the wind.

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Classification of the Animal Kingdom by Richard E. Blackwelder


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