Evaluation of Source Reliability Discussion Replies

 Evaluation of Source Reliability Discussion Replies

 
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1st person to respond to:



When I googled “Marie Tharp” the first three distinct sources that showed up were Wikipedia, The Mariners’ Museum and Park, and Woods Hole Oceanographic Institution. Out of these three I know I would look last at Wikipedia, just because I know it is not the most reliable source in general, since anyone can edit what is said on there. However, from the looks of it I would rely more on the Mariners museum and park website, just from looking briefly you can notice that there’s a bibliography which probes this can be a reliable source for information. I would also trust Woods Hole oceanographic institution because just from the website you can see it ends in .edu, meaning this is an educational website, and usually would be able to provide reliable information.
Reading about Marie Tharp I found that she contributed to the discovery of plate tectonics by Ocean floor mapping and making observations, she was able to discover that there was a Rift Valley and that’s what led to her forming the theory of continental drift and/or sea floor spreading. It might be important to revisit this historic information about Marie Tharp contribution because she was in a male dominated industry where it was not even allowed for women to be even on boats and whilst she found a way to manage and work through that to complete her work on mapping the ocean floor.



second person to respond to:



Three distinct sources that showed up for Marie Tharp are Science Magazine, The Mariner’s Museum and Park, and Wikipedia. I believe Wikipedia is an untrustworthy website to use to research information. Wikipedia is a website that any user can edit the information that may be inaccurate. Also, Wikipedia is not a trustworthy source because it does not have an author or date, thus lacking reliability. On the other hand, a news site I found may have accurate and trustworthy information is the Science Magazine. The Science Magazine has accurate and unbiased information because the website describes Marie Tharp’s biography. I think I can identify if a website may be an untrustworthy sourceThink of bubbles in your soda. Do they rise or sink? Will bubbles in a lava flow rise or sink? 49 • So if you have a solidified lava flow, where would you expect the rock to be most vesicular? Porphyritic texture magma starts to cool underground, • Ifcrystals will form. these mineral grains be large (>1mm) • Will or small (2cm 55 56 Another one Connect the texture to the place Fine grained The top of a lava flow Fine grained and vesicular The bottom of a lava flow Fine grained and porphyritic Deep underground Coarse grained Complex cooling history Coarse grained and porphyritic A lava flow, after the magma pooled underground for a while Another question 57 you find an outcrop of coarse-grained • Ifigneous rock, you are probably looking at: A.slowly cooled magma in a large pluton that formed deep in the crust. B.a frozen lava flow that cooled quickly at the Earth’s surface. C.rapidly cooled magma in a very thin dike. D.a layer of pyroclastic debris. You can never have too many questions! 58 a gas-rich (“volatile-rich”) magma • When rises to the Earth’s surface the gas forms ________ which, if frozen into the lava, become(s) ________. A.obsidian / pumice B.bubbles / vesicles C.tuff / granite D.gabbro / phenocrysts Igneous rock compositions 59 • The composition of a rock means the minerals it is composed of, and the chemical composition. • Since minerals are chemicals, there isn’t a big difference. Composition groups • There are four main composition groups: • Felsic • Intermediate • Mafic • Ultramafic • See section 4.2, p. 98–100 in your book. 60 61 Felsic • Felsic comes from feldspar and silica. with a felsic composition are rich in • Rocks potassium feldspar and quartz (silica). have only minor amounts of sodium• They rich plagioclase and ferromagnesian minerals. Mafic 62 comes from magnesium and ferrum • Mafic (Latin for iron). with a mafic composition are rich in • Rocks ferromagnesian minerals, especially pyroxene. also have lots of calcium-rich • They plagioclase. Intermediate 63 • Rocks with an intermediate composition are in between felsic and mafic. have no quartz, and roughly equal • They amounts of light colored feldspars (mostly sodium-rich plagioclase) and dark colored ferromagnesian minerals. Ultramafic 64 with an ultramafic composition are • Rocks like mafic rocks, only more so! are composed almost entirely of • They ferromagnesian minerals such as pyroxene and olivine. 65 66 There is room for a lot of variation within each composition group. Because of this, geologists subdivide each group. Silica content • Mafic rocks: ~50% silica, and contain dark-colored minerals that are abundant in iron, magnesium and calcium. • Felsic (silicic) rocks: >65% silica, and contain light-colored minerals that are abundant in silica, aluminum, sodium and potassium. • Intermediate rocks have silica contents between those of mafic and felsic rocks. • Ultramafic rocks: .·1..: ..,~-x.. ,.•..~--~ r.·-. ~~~:, ..~~-~i~1,~~·~\~~!~i.).~ ... :.l,.~.-=-.$'ij .-: iL~"-!J:?:, W•~: ~~11-;·,~ •..=·,,~- ;-?