the violence of nature教案1

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1、Module3TheViolenceofNature-FunctionFunction—教案■Goals●Tolearntogiveadefinition■ProceduresStep1:DefiningadefinitionAdefinitionmaybeastatementoftheessentialpropertiesofacertainthing,orastatementofequivalencebetweenatermandthatterm'smeaning.Thetwoarenotmutuallyexclusive,noraretheyequivale

2、nt.Aconciseexplanationofthemeaningofawordorphraseorsymbol.AstatementthatgivesthemeaningofawordorsymbolintermsthathasbeenpreviouslydefinedorareacceptedasundefinedStep2:GivingadefinitionAnearthquakeisatremblingorashakingmovementoftheEarth'ssurface.Earthquakestypicallyresultfromthemoveme

3、ntoffaults,quasi-planarzonesofdeformationwithinitsuppermostlayers.Thewordearthquakeisalsowidelyusedtoindicatethesourceregionitself.Thesolidearthisinslowbutconstantmotion(seeplatetectonics)andearthquakesoccurwheretheresultingstressexceedsthecapacityofEarthmaterialstosupportit....Avolca

4、noisageologicallandform(usuallyamountain)wheremagma(rockoftheearth'sinteriormademoltenorliquidbyhighpressureandtemperature)eruptsthroughthesurfaceoftheplanet.Althoughtherearenumerousvolcanoes(someveryactive)onthesolarsystem'srockyplanetsandmoons,onEarthatleast,thisphenomenontendstoocc

5、urneartheboundariesofthecontinentalplates.However,importantexceptionsexistinhotspotvolcanoes.Atornadoisaviolentwindstormcharacterizedbyatwisting,funnel-shapedcloud.Theword"tornado"comesfromtheSpanishorPortugueseverbtornar,meaning"toturn."Tornadoesforminstormsallaroundtheworld,mostfamo

6、uslyinabroadareaoftheAmericanMidwestandSouthknownasTornadoAlley.Althoughinpurenumberofincidences,theUnitedStatesexperiencesmoretornadoesthananyothercountry,theUnitedKingdomisthemostproportionallytornado-pronecountryforitssize....Ahurricaneisaseveretropicalcycloneusuallywithheavyrainsa

7、ndwindsmovinga73-136knots(12ontheBeaufortscale)