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Mineral Resource of the Month: Iron and Steel Slag

Iron and steel slag, also known as ferrous slag, is produced by adding limestone (or dolomite), lime and silica sand to blast furnaces and steel furnaces to strip impurities from iron ore, scrap and other ferrous feed materials and to lower the heat requirements of the iron- and steelmaking processes. Ferrous slag forms as a dominantly calcium silicate melt that floats on top of the molten crude iron or steel; the slag is then removed from the liquid metal.
 
01 Jan 2016

Energy Notes: June 2014 - 2015

Oil and petroleum imports data are preliminary numbers taken from the American Petroleum Institute’s Monthly Statistical Report. For more information visit www.api.org.

01 Jan 2016

Down to Earth With: GEO Secretariat Director Barbara Ryan

When Barbara Ryan enrolled as a freshman at the State University of New York in Cortland, she enjoyed athletics so much that she planned to pursue a career in physical education and coaching. Then her roommate convinced her to take a class in paleontology. She was hooked, and within months Ryan changed her major to geology, launching herself down an entirely different path. 
 
18 Dec 2015

Public improvements, private funding

Seattle city engineer Reginald H. Thomson may have been the driving force behind the Denny Hill regrades, but they could not have occurred without public support. In order for a regrade to proceed, at least 50 percent of the people who lived in the affected areas had to sign a petition. For example, the Second Avenue regrade needed the signatures of 67 property owners. A completed petition triggered the next phase, which was a city council ordinance that defined the boundaries of the regrade. A second ordinance then provided the funding mechanism, or what was known as a Local Improvement District (LID). 

10 Dec 2015

Benchmarks: December 10, 1930: Seattle’s Denny Hill disappears

Few cities in the United States can rival Seattle for the scale of reengineering to its landscape. Not only did its citizens make more than 890 hectares of new land in its harbor, but they also replumbed the city’s largest lake, completely changing its drainage pattern and drying up its main outlet, and regraded tens of millions of cubic meters of its hills. The most famous of these projects was the elimination of Denny Hill, a 73-meter-high hill that stood at the north end of Seattle’s central business district.
 
10 Dec 2015

Mineral Resource of the Month: Lime

Lime is the common term for several chemicals in three major categories: quicklime, hydrated lime and refractory dead-burned dolomite. Lime is almost never found naturally. It is primarily manufactured by burning limestone in kilns, followed by hydration when necessary. 

08 Dec 2015

Energy Notes: May 2014-2015

U.S. Oil & Petroleum Imports (million of barrels per day)

Oil and petroleum imports data are preliminary numbers taken from the American Petroleum Institute’s Monthly Statistical Report. For more information visit www.api.org.
 

08 Dec 2015

Down to Earth With: Paleobiologist Nigel Hughes

I first met Nigel Hughes, a paleobiologist at the University of California at Riverside (UCR), in 2010. He took me on a brisk walk through the UCR Botanical Gardens, where the trees kept us cool in the hot Southern California sun while he told me all about trilobites. 
 
03 Dec 2015

Geomedia: Gifts: Holiday Gift Guide

Science is definitely the new chic, so we’ve tracked down the latest and greatest science accessories and furnishings to help you find the perfect gift for home or office. From agate nightlights to fun science jewelry, this list is sure to have something your science lover will enjoy. Plus, we have some suggestions for great presents for the budding young scientists in your life.
 
28 Nov 2015

Geomedia: Television: 'NOVA: Making North America' Is Flashy, But Fails on Storytelling

A new three-hour-long documentary, “NOVA: Making North America,” airing in November, purports to tell the geological, biological and anthropological story of North America. Unfortunately, it falls short on many counts.

17 Nov 2015

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