They can occur for days, weeks, months, or years after the large earthquake. Geology is the study of the Earth, the materials of which it is made, the structure of those materials, and the processes acting upon them. "Net Acreage" is the gross acreage multiplied by the fractional share of any individual owner or lessee. The dip angle of the fault plane is between 45 and 90 degrees. IHS Kingdom Suite. Contrast with unassociated gas. The photo shows the south face of Fajada Butte, Chaco Culture National Historical Park. Lavas with a relatively low viscosity can form a "ropy" surface. The volume of water needed to flood one acre of land to a depth of one foot. See more. An igneous rock that has a relatively high silica content. Frequently referred to by the layman as "hard coal.". The one on the right is known as "watermelon" for obvious reasons. A glacier that occurs in a mountainous region and occupies a valley. The Facts on File Dictionary of Geology and Geophysics. "Geology" is a much more limited science and just one part of "Earth science.". An extinct group of marine invertebrate animals that produced a chambered shell. Some people assume that "geology" and "earth science" are identical, but that is not true. The interior of 'a'a is very dense. Shown in the photo is a section of "The Great Unconformity" of the Grand Canyon. The removal of surface material from a meteoroid as it passes through Earth's atmosphere. A square property that is 208.71 feet long and 208.71 feet wide is approximately one acre. Image copyright iStockphoto / Barcin. Research Interests. The desert pavement surface shown here is on an alluvial fan in the Providence Mountains State Recreational Area of California. As the bit cuts down through the rock, the "core" is contained within the last section of drill pipe. This dictionary is compact and inexpensive at only $19.99. Home Page. IHS Kingdom creators of Kingdom Suite, an industry-standard 3D seismic and well log visualization and interpretation system. About every thirty feet, all of the drill pipe and the drill bit are pulled from the well so the core can be lifted to the surface and removed. It is found in deposits around the world. Four- and six-ray stars are most common. Also known as a "valley glacier.". An area, measured in acres, that is owned or controlled by one or more owners or lessees. Click on an underlined word for more information on that subject. Some people assume that "geology" and "Earth science" are identical, but that is not true. Also, consider ametrine, a bicolor quartz that is a combination of AMEthyst and ciTRINE believed to be caused by twinning. "Geology" is a much … By definition, a coal with a fixed carbon content of over 91% on a dry ash-free basis. A geology dictionary that is used regularly is one of the most important tools for developing professional competence. The acid is neutralized by the dilution and the water is unable to carry the dissolved metal ions. Accretion is the accumulation of sediment (mud, sand, etc.) It is composed of broken lava blocks called clinkers. It sometimes has a fibrous texture that produces a strong cat's eye when cut en cabochon. The word usually triggers an image of attractive mineral materials that have been fashioned into gems to be worn for personal adornment. This can be caused by a change in the composition or temperature of the fluid from which the crystal was growing; twinning; or, variations in exposure to heat or radiation. Mark R. Frank - economic geology, experimental petrology, mineralogy and geochemistry. The phenomenon is called a "star" and is seen in gems such as sapphire, ruby, enstatite, diopside, garnet, and spinel. A conspicuous hill with steep sides and a flat top. Trails of these ablated particles are often visible from Earth as a bright streak of light sometimes called a "shooting star" or a meteoroid trail. It is caused when many tiny platelet-shaped inclusions of a reflective mineral such as mica or copper or hematite are aligned with a common orientation within the gem material. the study of this science. Department receives a $2.18M donation of Move™ structural analysis and visualization software from Petroleum Experts, Inc. - August 1, 2019; Our 2018 issue of the Geogram is complete and ready for viewing. Antibiotics, Pharmaceuticals, and Personal Care Produce Because it is relatively fragile, it is best used where it will not suffer abrasion or impact. A hollow cylindrical drill bit used for cutting a cylinder of rock, called a "core," from a well. Also see entries for basic, intermediate, and ultrabasic rocks. Aventurescence is the defining phenomenon of the gem material known as aventurine. Shown in the photo is the Badwater Alluvial Fan of Death Valley. Click on an underlined word for more information on that subject. More information. Enchanted Learning members, log in here. The rocks in the core of an anticline are the oldest. The graduate committee must approve the subject areas of the examination. It ranges from a very light blue to a richly saturated blue, with the richer color being much more desired. Also used in mineral resource calculations (an acre-foot of coal is a block of coal one acre in area and one foot thick - it weighs approximately 1,800 tons). In map view it has the shape of an open fan. It has a Mohs hardness of 6 with perfect cleavage. A good dictionary should be on the desk of every geologist and within easy reach. A pair of virtual field trips prepared by two JMU geology professors have been placed in the “Exemplary Teaching Activity collection.” Read More > Nov 10 Rare minerals gift makes JMU museum a must see. A geology dictionary that is used regularly is one of the most important tools for developing professional competence. Equivalent to 43,560 cubic feet, 1,233 cubic meters, or 325,851 gallons. Their fossilized shells are often cut and used as an ornamental or jewelry stone. Abandoned mine lands are dangerous places. Also provided are web sites, electronic journals, electronic texts, and online associations to further research in each area. An unconsolidated accumulation of stream-deposited sediments, including sands, silts, clays, or gravels. It is a quick look-up tool for students engaged in … Abandoned mines are typically the source of acid discharge and can continue to produce acid discharge for decades without remediation. Natural gas that is found in a reservoir with crude oil. The term is also used for the rock materials after the flow has cooled. Minerals such as olivine or plagioclase which have a solid solution series are frequently zoned. This dictionary is compact and inexpensive at only $19.99. An optical phenomenon that is seen as a flash of light as a gemstone is moved under a source of incident light. Agate is a cryptocrystalline quartz that is translucent and patterned with bands, plumes, dendrites, or inclusions that produce a colorful, interesting appearance. Dictionary of Geological Terms - Only $19.99. A fan-shaped wedge of sediment that typically accumulates on land where a stream emerges from a steep canyon onto a flat area. The examination committee determines whether the student passes or fails the examinations and whether or not an oral exam is required. Actinolite is green to grayish green mineral of the amphibole group found in metamorphic rocks. [Coleman Reference Collection – QE5.K42 1996] Lapidus, Dorothy Farris. It is also cut as a gem when found in clear crystals with attractive colors. GEOLOGY la géologie: GROTTO la grotte: LAND la terre: LAVA la lave: MAGNET l'aimant: MAP la carte: MARBLE le marbre: MINERAL minéral: MOUNTAIN la montagne: PEBBLE le caillou: QUARTZ le quartz: ROCK la roche: SAND le sable: SOIL le sol, la terre: STONE la pierre: VOLCANO le volcan Ametrine is a bicolor quartz that is half AMEthyst and half ciTRINE. [Coleman Reference Collection – QE5.C45 1985] Kearey, P. The New Penquin Dictionary of Geology. Each orientation of these parallel inclusions within the stone produces a single line on the surface of the stone. An important part of geology is the study of how Earth’s materials, structures, processes and organisms have changed over time. It includes the study of solar system astronomy, geology, oceanography and meteorology. An area of increased dip in otherwise gently dipping strata. There may or may not be enough pressure in the aquifer to make it an "artesian aquifer.". The anticline in the photo is along New Jersey Route 23 near Butler, NJ. Apatite is a phosphate mineral that is mainly used in making fertilizer. More information. ... A. This weak zone allows the plates of the lithosphere to slide across the top of the asthenosphere. If the rock or mineral term you are looking for is not in the dictionary, please e-mail us and we'll add it. The removal is caused by air molecules impacting the meteoroid, which is probably traveling at a speed of at least 20 kilometers per second. glacier A glacier is a large, slowly-moving river of ice. A portion of the upper mantle that is directly below the lithosphere. A basic unit of matter that consists of a central nucleus surrounded by shells of negatively charged electrons. Orthoclase, plagioclase, and microcline would be "alkali feldspars." Strain accumulates on active faults, and some creep slowly over time. Hornblende, tremolite, actinolite, and glaucophane are examples. The satellite image at left shows Rose Atoll. Roughneck is a slang term for an oil field worker who does hard manual labor on the floor of a drilling rig. The written exams must all be taken within a period of one week. Earth Science is the study of the Earth and its neighbors in space. Eventually all of the particles that can be carried by the wind will be removed, leaving a rocky surface known as a "desert pavement." Alluvial fans typically form in arid or semiarid climates. An atom with a negative charge that has been produced by the gain of one or more electrons. The highest rank of coal. Alluvial fans typically form in arid or semiarid climates. Amazonite is a trade name given to a light green to bright green variety of microcline feldspar. The opposite of an aquifer. Reflections can also be seen if the light source is moved or the eye of the observer is moved. gold Gold is a precious metal. The top is usually a cap-rock of resistant material. It is also cut as an opaque gemstone and sometimes ground to a powder for use as a pigment. As the back-to-school season commences, Geology.com has a variety of new resources to serve teachers and students of geology, geography and earth science. The water in this aquifer is under atmospheric pressure and is recharged by precipitation that falls on the land surface directly above the aquifer. A zone of low strength in the upper mantle defines the top of the asthenosphere. It produces a bright flash of color that rivals fine opal and labradorite. A variety known as chiastolite has grains of graphite concentrated into a cross-shaped feature. It is one of the most popular faceted gemstones and is sometimes cut en cabochon. The gas may be in a free gas cap above the oil within the reservoir structure because of its lighter density, or, the gas might be dissolved within the oil and come out of solution when the pressure is reduced. 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