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121Fossil fuel — Coal, one of the fossil fuels. Fossil fuels are fuels formed by natural processes such as anaerobic decomposition of buried dead organisms. The age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes… …
122RLC circuit — A series RLC circuit: a resistor, inductor, and a capacitor An RLC circuit (or LCR circuit) is an electrical circuit consisting of a resistor, an inductor, and a capacitor, connected in series or in parallel. The RLC part of the name is due to… …
123SEPTA Regional Rail — Infobox SG rail railroad name=SEPTA Regional Rail logo filename=SEPTA.svg system map size=300 map caption=SEPTA Regional Rail system map logo size=100 old gauge=RailGauge|sg marks=SPAX locale=Delaware Valley start year=1983 end year=present hq… …
124geomagnetic field — Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth s surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the… …
125Overexploitation — Atlantic cod stocks were severely overexploited in the 1970s and 1980s, leading to their abrupt collapse in 1992.[1] Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns.… …
126Weighting filter — A weighting filter is used to emphasise or suppress some aspects of a phenomenon compared to others, for measurement or other purposes. Contents 1 Audio application …
127Old Fashioned Oriental Frill — The Classic Oriental Frill is an exhibition breed of pigeon from the Owl family. It is a Turkish breed specially bred for the Ottoman Sultans. In its homeland it is known as Hünkari: the bird of the Sultans. It is known that upon the sultans… …
128Wave equation — Not to be confused with Wave function. The wave equation is an important second order linear partial differential equation for the description of waves – as they occur in physics – such as sound waves, light waves and water waves. It arises in… …
