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Geology Test 2

Why do most metamorphic rocks have a fabric (planar and/or linear alignment of mineral grains) Because most have been dynamically recrystallized
Durring strike-slip faulting: Crustal blocks scrape past one another, which frequently leads to massive earthquakes
Which of these was NOT part of the evidence supporting sea-floor spreading? The homogeneous basaltic composition of sea floor lavas
When stressed slowly, silly putty: Gets thinner and thinner, like deep crustal rocks at a divergent plate boundary
It is famously difficult to determine the age of deposition of clastic sedimentary rocks using absolute geochronology techniques. The best approach to this problem would be: Attempt to date the mineral cement that holds grains together
Reverse faults and folds are related in this way: The both result from compression
Which is most accurate about seismic waves P-waves travel more rapidly through dense material than through llow-density material
Which is most accutate about metamorphism? Mafic (basalt); the crust is thinned, and the mantle melts as pressure decreases
Which of the following is most accurate about the significance of metamorphic rocks? The record evidence of how the crust thickens, thins, and is deformed over time
Which of these is most llikely to blame for the destructive 1811-1812 New Madrid earthquakes (in the interior of the North American continent) Sudden release of stress on ancient faults, where the crust is weak
Which is most accurate about earthquakes? The happen where stress builds and released suddenly
What is most accurate about atoms of radioactivity carbon-14 They form when cosmic rays collide with atoms of atmospheric nitrogen-14
An earthquake occurs in Mexico City, Mexico. The following is most accurate: P-waves from the quake arrive at our seismograph in Oswego before S-waves
A perfectly preserved bone fragment has been buried for exactly two carbon-14 half-lives. How long has the fragment been in the ground? (Carbon-14 half life = 5380yr) 10,760 years ( Times halflife by 2. (“exactly two carbon-14 half-lives”))
Why does thickening the crust generate orogenic belts containing huge bodies of granite (batholiths)? When the crust thickens, high grade metamorphic reactions release water, melting the crust.
Which of these is the most diagnostic for estimating the Mercalli intensity of an earthquake in an area: the identification of ground rupture and broken underground utility pipes
Which would be the case if the Earth did NOT have a solid inner core: (a) There would be no S-wave shadow zone. (b) The S-wave shadow zone would be much smaller than it is today. (c) P-waves and S-waves would travel through the Earth in the same amount of time. (d) none of these (The answer is none of these)
The age of the formation of the Earth is (within ±5%): 4.5 Byr (billion years).
Earthquakes are concentrated at plate boundaries, but some occur in the interiors of plates, far from boundaries. What does this tell us about stress in the crust as a whole? Stress occurs throughout the entire crust, stress released more often at weak points
Why does oceanic crust contain rocks exclusively less than 200 Myr old, whereas every continent contains rocks in excess of 2000 Myr old? - Oceanic crust denser than continental crust melted down into mantel
Give THREE pieces of evidence that Wegener used to support his theory of continental drift. Fossils, Glaciers, Rock ages,
Reverse Fault Acute angle went up, obtuse went down
Sheer Stress Compressional Boundary
Created by: rpm02044