Endangered travel destinations around the world
by Elizabeth Olson Glacier National Park Related Links Distinctive Destinations in the U.S. Extreme Vacations…
Preservation and conservation milestones in the United States by Holly Hartman 1840s–1860s1870s–1880s1890s–1920s1930s–1960s1970s1980s1990s2000sMost Recent Entry 1849 The U.S.…
Did you know most rain in the United States starts as snow? This video explains how water changes state during precipitation, resulting in snow, sleet, hail, or rain.
IntroductionWater-Borne Diseases: Cholera and DysenteryIntroductionCholera: Scourge of the PoorEpidemic Dysentery In This Section Major water-borne diseases Why water-borne disease primarily affects…
Ozone acts as a powerful respiratory irritant at the levels frequently found in most of the nation's urban areas during summer months. Symptoms include shortness of breath, chest pain when…
TURBINESFIND OUT MOREMany modern machines, from motorbikes to jet aircraft, are powered by engines. An engine is a machine that turns fuel into movement. The fuel is burned to generate heat…
(Encyclopedia) American water spaniel, breed of medium-sized sporting dog developed in the American Midwest. It stands about 17 in. (43.2 cm) high at the shoulder and weighs between 30 and 40 lb (13.…
(Encyclopedia) Irish water spaniel, breed of large sporting dog developed in Ireland in the 19th cent. The tallest of the spaniels, it stands about 23 in. (58.4 cm) high at the shoulder and weighs…
(Encyclopedia) Delaware Water GapDelaware Water Gapdĕlˈəwâr, –wər [key], scenic gorge, 2 mi (3.2 km) long, cut by the Delaware River through Kittatinny Mt., on the N.J.–Pa. line; located in a…
