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The planet we live on: The beginnings of the Earth Sciences

The planet we live on: The beginnings of the Earth Sciences

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Heat engine A pump and heat exchangers used to extract heat from <strong>the</strong> ground or <strong>the</strong>air to heat buildings; can be reversed to add heat to <strong>the</strong> surroundings in order tocool buildingsHeating <strong>of</strong> hydrocarb<strong>on</strong> source rocks Rocks have to be heated to release hydrocarb<strong>on</strong>s;most gas and oil are released bet<str<strong>on</strong>g>we</str<strong>on</strong>g>en 100 and 200°C; above 200°C <strong>the</strong>y aredestroyedHeavy mineral survey Stream or soil survey for minerals <strong>of</strong> higher density than average,such as diam<strong>on</strong>d, gold or ilmenite (titanium ore)Hematite An ir<strong>on</strong>-c<strong>on</strong>taining mineral (Fe 2 O 3 ), earthy red, metallic lustre, feels dense,red streak, usually hard, <strong>of</strong>ten found in irregular massesHominid <str<strong>on</strong>g>The</str<strong>on</strong>g> family (group) <strong>of</strong> primate species, <strong>of</strong> which Homo sapiens is <strong>the</strong> <strong>on</strong>ly <strong>on</strong>eliving; all <strong>the</strong> o<strong>the</strong>r hominid species have become extinctHydrocarb<strong>on</strong> <str<strong>on</strong>g>The</str<strong>on</strong>g> fossil fuels, coal, crude oil, and natural gasHydrocarb<strong>on</strong> reservoir rock Rock with enough pore space and permeability to holdhydrocarb<strong>on</strong>s and to allow <strong>the</strong>m to flow outHydrocarb<strong>on</strong> source rock Rock from which crude oil or natural gas originally came;<strong>the</strong> decay <strong>of</strong> plankt<strong>on</strong> in mudst<strong>on</strong>es/shales produced oil and some gas whilst mostgas comes from coalHydrocarb<strong>on</strong> trap <str<strong>on</strong>g>The</str<strong>on</strong>g> shape <strong>of</strong> a formati<strong>on</strong> that can trap hydrocarb<strong>on</strong>s underground;includes anticlinal, fault and unc<strong>on</strong>formity traps and traps associated with saltdomesHydrogeology Study <strong>of</strong> subsurface water, called groundwaterHydrology Study <strong>of</strong> <strong>the</strong> whole <strong>of</strong> <strong>the</strong> water cycle, both above and below groundHydro<strong>the</strong>rmal fluid Hot watery liquid produced by some magmas and by <strong>the</strong> heating<strong>of</strong> rocks deep underground; rises and cools to crystallise mineralsIgneous rock Rock formed by <strong>the</strong> cooling <strong>of</strong> liquid magma or lavaImpermeable A material that fluids cannot flow throughIncluded fragments (law <strong>of</strong>) <str<strong>on</strong>g>The</str<strong>on</strong>g> stratigraphic law that anything (e.g. pebbles in c<strong>on</strong>glomerates,fragments <strong>of</strong> <strong>the</strong> surrounding rock in plut<strong>on</strong>s) included in anything elsemust be olderInfiltrati<strong>on</strong> (<strong>of</strong> water) Water percolating down into <strong>the</strong> ground surface, usually fromsurface precipitati<strong>on</strong> (rain, snow, etc.)159

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