ANSWERS TO QUESTIONS ON PAGE 28 Answers:


1. The answer is choice “c” or [“Dacite” is intermediate in composition between “rhyolite” and “andesite”]. “Dacite is the volcanic counterpart of “granodiorite.” Typically, it is gray and porphyritic in texture. Its mineral composition includes an abundance of “plagioclase” feldspar, along with amphibole, pyroxene and quartz.


Choice “a” best describes the “andesite” as the volcanic counterpart to “diorite.”


Choice “b” could describe rocks such as “rhyolite” and “trachyte” rather than “dacite.”


By the way, in French, “piton” may refer to a “mountain peak.”


2. The answer is choice “b” or “wollastonite.” “Wollastonite”


(CaSiO3) is a calcium silicate that occurs mainly as a contact metamorphic mineral in crystalline limestone.


Choice “a” constitutes “diopside” ([CaMg((Si2O6)] which is a calcium-magnesium pyroxene that is also found as a contact metamorphic mineral in crystalline limestone.


Choice “c” or “spodumene” [LiAl(Si2O6)] is a lithium alu- minum silicate that may be found in very large crystals


in pegmatite dikes. 3. The answer is choice “c” or “lopolith.”


Choice “a” or “laccolith” is also a concordant pluton, but with a flat floor and a rounded roof that has pushed over- lying sediments into a dome.


Choice “b” or “sill” describes another concordant pluton, but tabular (rather than massive) and generally close to horizontal.


4. The answer is choice “a” [Structurally belong to the “tec- tosilicates].


These minerals, along with “cancrinite”, “sodalite” and “analcite” are “feldspathoids.” “Feldspathoids” are readily attacked by acids. They appear in place of feldspars in magmas that are alkali-rich and deficient in silica.


5. The answer is choice “c” or “3.03 minutes.” The proof fol- lows:


We are given: F = W * d


P = W/t 1 hp = 550 ft-lb/sec


(1) (2) (3)


The “work” done in lifting the coal is: W = F * d = 50,000 * 20 = 1,000,000 ft-lb (4)


Based on (3), a 10 horsepower engine can do, in 1 second, “work” of:


10 * 550 ft-lb = 5,500 ft-lb (5)


Substituting (4) and (5) into (2) and solving for time (t): t = W/P = 1,000,000 ft-lb / 5,500 ft-lb/sec t = 181.82 sec = 3.03 minutes


(6) Member in the News


James A. Jacobs of California recognized for contributions to increasing understanding of groundwater


(WESTERVILLE, OH — November 3, 2016) James A. Jacobs, PG, CHG, CPG, CPetG, is among the first five to receive the National Ground Water Association’s new Fellow designation in recognition of outstanding credentials, profes- sional accomplishments, and commitment to promoting the increased understanding of groundwater science and water well system technology.


Jacobs is with the Clearwater Group in Pt. Richmond, California.


“James A. Jacobs has a career of substantial achievement within the geologic and hydrologic industries, academic envi- ronment, and political tapestry,” stated nominator Stephen J. Baker of Operation Unite, Nevada City, California. “His achievements are represented in many venues including sharing knowledge and contributions through outreach activi- ties, technical publications, leadership roles in groundwater associations, and elected positions.”


Among Jacobs’ many groundwater industry accomplish- ments are:


Winning four Fulbright senior specialist grants in envi- ronmental engineering and sciences; his tours helped to support undergraduate and postgraduate students in Jamaica, Israel, and India





Developing, coauthoring, and editing four technical books on environmental topics


Writing more than 100 technical articles on hydrogeology, groundwater treatment, and environmental issues


Delivering key lectures to the general public through European, Caribbean, Central American, Alaskan, and Hawaiian cruises


Mentoring geology students by giving talks in local K-12 schools, judging the California State Science Fair junior and senior geology sections, and developing programs sponsored by the American Institute of Professional Geologists for the University of California, Davis, and other college campuses.


“All of these outreach platforms have accelerated public awareness of groundwater quality and quantity issues,” con- tinued Baker.


The NGWA Fellow designation will be presented to Jacobs during NGWA’s 2016 Groundwater Week December 6-8 in Las Vegas, Nevada.


NGWA, the leading worldwide advocate for professionals teaming to provide, protect, manage, and remediate ground- water, conveniently and promptly delivers an extensive range of resources contributing to member success through relation- ships, leading edge and emerging practices, and credible new ideas and solutions.


www.aipg.org


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