Social Science test

Jun 30th, 2015
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Q – 1 Fill in the Blanks: 1). Water covers __________ per cent of the earth’s surface and land covers _________________ per cent of it. 2). There are _____________________ continents in the world. 3). The continents are separated by large expanses of water called ______________

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LECTURE 4IGNEOUS ROCKSWhat is a rock??Solid material composed of?minerals ?glass ?organic matter ?pre-existing rocksTHE ROCK CYCLEIgneous rocks?rocks formed from ?molten material called magma or lava OR?deposits/debris of volcanic eruptionsMagma?Molten rock composed of varying amounts of?Liquid?Silicate (sometimes carbonate or sulfide)?Ions of K, Na, Fe, Ca, Mg, Al?Solid?Minerals ?Rock fragments?Dissolved gas? H2O, CO2, SO2?Temperature: 600-1200oC?Classification (chem'l composition)?Felsic, Silicic or acidic?- >63% SiO2 (Granitic, coarse grained)?Intermediate - 52-63% SiO2 (Continental Crust, Andesitic - composition between basaltic and granitic rocks) ?Mafic or basic- 45-52% SiO2 (Oceanic Crust, Basaltic, fine-grained, extrusive)?Ultramafic or ultrabasic - <45% SiO2 (Mantle, Peridotite)?Viscosity - property to resist flow?Effects of different factors-? temperature, ? viscosity-? SiO2, ? viscosity-? dissolved H2O, ? viscosity?Density?heavier oceanic crust mafic rocks?lighter continental crust felsic rocks?Summary of properties: ultramafic mafic intermediate felsictemperaturehighlowsilica contentlowhighviscositylowhighdensityhighlowFormation of magma?Melting of Upper mantle OR Lower crust due to Increased temperature (rocks melt at 1200 C or 1400 C)Decrease in pressure (high pressure keeps rocks solid) and Addition of volatilesFrom magma to rocks??mag

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