Download PDF by Rob Nagel: UXL Encyclopedia of Science

By Rob Nagel

ISBN-10: 0787654329

ISBN-13: 9780787654320

Contains six hundred themes within the existence, earth, and actual sciences in addition to in engineering, know-how, math, environmental technology, and psychology.

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Abrasives can be either natural or synthetic materials. Until the twentieth century, humans used naturally occurring materials, such as sandstone, quartz, emery, corundum, diamonds, and garnet, as abrasives. Then, in 1891, American inventor Edward G. Acheson (1856–1931) produced silicon carbide by heating a mixture of clay and coke. For 50 years, silicon carbide (also known as CarborundumTM) was the second-hardest substance known, after diamond. This property made it popular as an abrasive. Other synthetic compounds, such as aluminum oxide, boron carbide, and boron nitride are also used now as abrasives.

Some lakes in Scandinavia and New York’s Adirondack Mountains are completely devoid of fish life. Acid rain also eats away at buildings and metal structures. From the Acropolis in Greece to Renaissance buildings in Italy, ancient structures are showing signs of corrosion from acid rain. In some industrialized parts of Poland, trains cannot exceed 40 miles (65 kilometers) per hour because the iron railway tracks have been weakened from acidic air pollution. Treatment of water bodies affected by acid rain Usually, waters affected by acid rain are treated by adding limestone or lime, an alkaline substance (base) that reduces acidity.

The plant has adapted to seasonal changes in precipitation by restricting leaf growth in the dry season. ) U•X•L Encyclopedia of Science, 2nd Edition 2 9 Adaptation Biologists now recognize natural selection as the means by which evolutionary adaptation occurs. Exactly how specific adaptations arise, however, is far from solved. It is easy to imagine how natural selection might produce relatively simple adaptations such as camouflage: a rabbit that lives in regions covered by snow in winter is better protected from prey if it produces a white coat during the winter months.

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UXL Encyclopedia of Science by Rob Nagel

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