Mafic - Study guides, Class notes & Summaries

Slate(Metamorphic) ~ -low-grade metamorphism -fine gained - originally mudrocks, and volcanic ash Phyllite (Metamorphic) ~ -glassy sheen an wavy texture -more temp and pressure than slate -Composed mainly of fine crystals of muscovite and chlorite Schist(Metamorphic) ~ -Medium to coarse grained -schist describes its texture(strongly foliated aka schistosity) More temp and pressure than phyllite Gneiss(Metamorphic) ~ -Medium to coarse-grained -High-grade metamorphism(very high temp ...

The average thickness of oceanic lithosphere is closest to: a) 5km b) 10km c) 30km d) 100km e) 1000km ~ d) 100km You are in Iceland, witnessing a lava flow. What is most likely to be the composition of the lava? : a) felsic b) mafic c) ultramafic d) iron e) intermediate ~ b) mafic You are in the middle of the Pacific Ocean on a ship equipped to drill holes straight down into solid rock at the bottom of the sea. You are trying to drill such a hole down to the Mohorovivic Disco...

Which magma can interact with external water? - correct answer all -mafic more likely though What's another name for intermediate to felsic eruptions? - correct answer silicic eruptions Where do eruptions involving external water typically occur? - correct answer where we have external water -does not necessarily mean ocean though because seafloor in some deep places may suppress explosivity What is phreatomagmatic volcanism? - correct answer magma encounters and explosively mixes wi...

Magma with high silica content tends to be - Answer-very viscous magma with low silica content tends to be - Answer-very fluid submarine eruptions of volcanoes - Answer-form pillow basalts which type of volcano is commonly composed of andesite - Answer-composite volcano an igneous rock made of pyroclasts has a texture called - Answer-fragmental the largest known shield volcanoes on Earth occur in - Answer-Hawaii Mafic igneous rocks contain - Answer-50% silica, MG and iron tw...

Which is not a requirement for a mineral? A) naturally occurring B) consistent isotopic composition C) well-formed external crystal shapes D) orderly regular atomic or ionic structure E) definite chemical composition - B Which of the following best describes the fundamental concept of superposition? A) Strata with fossils are generally deposited on strata with no fossils. B) Older strata are deposited on younger strata without intervening, intermediate age strata. C) An igneous dyke cut...

Which of the following best describes the fundamental concept if superposition? - Any sedimentary deposit accumulates on older rock or sediment layers. New oceanic crust and lithosphere are formed at ______________ - divergent boundaries by submarine eruptions and intrusions of mafic magma Deep ocean trenches are surficial evidence for _________________ - Sinking of oceanic lithosphere into the mantle at a subduction zone. Since the early Mesozoic, the ________ has been passive tectonica...

The assemblage of albite, chlorite, actinolite, and calcite would be most characteristic of - correct answer greenschist facies The assemblage of hornblende + plagioclase would most likely be - correct answer amphiboite facies In carbonates wollastonite + anorthite + diopside would most likely be - correct answer sanidinite facies The formula K(AlSi3O8) is for what mineral - correct answer sanidine What are some common associative minerals with sanidine - correct answer Qua...

Compared to the age of the Universe of about 14 billion years, the currently accepted age of Earth is about ________ years as determined by using radioactivity for dating rocks and minerals. A) 4.6 thousand B) 4.6 billion C) 5.4 million D) 13.7 billion - B The ________ division of the geologic time scale is an era of the Phanerozoic Eon. A) Paleocene B) Paleozoic C) Permian D) Proterozoic - B The Earth's core was formed from ________. A) a massive nickel iron asteroid that was the n...

UCLA eps SCI 1 final Exam Questions and answers, rated A+ Calculate the amount of time a transform fault takes to slip a given amount, given its slip rate. - - distance between LA and SF: about 500 km slip rate of San Andreas fault: about 20 mm/yr (1 km = 1000 m; 1 m = 1000 mm)Dodgers/Giants rivalry will be a cross-town one once again in....? 25,000,000 years (25 million years)(1 year1000mm1000m500km)/(20mm1m*1km) used dimensional analysis since we can't use a calculator on the midte...

EAS 210 MIDTERM 1 WITH COMPLETE SOLUTIONS 100% minerals are - correct answer naturally occurring, inorganic, crystalline solids minerals do not contain certain materials: - correct answer vegetation, coal, oil and gas water in the form of ice is a - correct answer mineral crystalline structure: - correct answer consistent, repeating internal arrangement of atoms e.g. quartz, SiO2, calcite - correct answer have fixed chemical compositions Formed when one or more electrons are tr...