... , especially melanoma, the malignant variety of skin cancer. How is Ozone Destroyed? Technically speaking, ozone - as with any other chemical substance - is not "destroyed,"" it is merely transformed into some other chemical compound. Unfortunately, these compounds are not useful in blocking harmful ultraviolet radiation. Ironically, increased levels of CFCs, bromide compounds, nitrites, and nitrates released by industry are not ... that will not be replaced by any natural process, decreasing the total number of oxygen atoms in the ozone layer as a whole, and specifically above places th...

• Word Count: 1616
• Approx Pages: 6
• Has Bibliography
• Grade Level: Undergraduate

... sum of its parts, the parts being individual plants of individual species, and the species present and their relative proportions are important descriptive components of it. Descriptions of vegetation take into account plant species and their abundance and size distribution, life forms (trees, shrubs, herbs, bryoids, epiphytes, lianas), seasonal functions (evergreen vs. deciduous), and leaf shapes, sizes ... great variation in tolerance to environmental extremes, maximal in endothermal birds and mammals. Land and water are two basic environments, and many animals move between them or sec...

• Word Count: 12375
• Approx Pages: 50
• Has Bibliography
• Grade Level: Undergraduate

... century saw the continental expansion of the United States and a transportation revolution that resulted from it, as well as industrialization, astonishing population growth and urbanization. The artistic community was called into action, producing whole schools of painting, which glorified the development of the nation. Starting with the Hudson River School founded by Thomas Cole, the nation obtained a visual representation of Manifest ... particularly interesting to note that it was also entitled Manifest Destiny. The central character, an allegory of progress, is described as a "beaut...

• Word Count: 3252
• Approx Pages: 13
• Grade Level: Undergraduate

... original pest. In the 1960s, wildlife biologists were puzzled when the gannet population on Bonaventure Island, Quebec, began to shrink. The shells of the gannets' eggs were too thin to protect the embryos. Only after the eggs had been analysed did the scientists identify the culprit DDT, which had been bioconcentrated through higher levels of the food web. ... , canola oil and baking soda have pesticidal applications and are considered biopesticides. At the end of 1998, there were approximately 175 registered biopesticide active ingredients and 700 products. Biopesticides fall into thre...

• Word Count: 2580
• Approx Pages: 10
• Grade Level: Undergraduate