Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

It is currently 16 Jul 2019, 10:01

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Prior to 1965 geologists assumed that the two giant rock

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
B
Joined: 16 Feb 2018
Posts: 14
Location: India
Schools: DeGroote'21 (S)
GPA: 3.5
Prior to 1965 geologists assumed that the two giant rock  [#permalink]

Show Tags

New post 02 Oct 2018, 04:26
Prior to 1965 geologists assumed that the two giant rock plates meeting at the San Andreas Fault generate heat through friction as they grind past each other, but in 1965 Henyey found that temperatures in drill holes near the fault were not as elevated as had been expected. Some geologists wondered whether the absence of friction-generated heat could be explained by the kinds of rock composing the fault. Geologists' pre-1965 assumptions concerning heat generated in the fault were based on calculations about common varieties of rocks, such as limestone and granite; but “weaker” materials, such as clays, had already been identified in samples retrieved from the fault zone. Under normal conditions, rocks composed of clay produce far less friction than do other rock types.

In 1992 Byerlee tested whether these materials would produce friction 10 to 15 kilometers below the Earth's surface. Byerlee found that when clay samples were subjected to the thousands of atmospheres of pressure they would encounter deep inside the Earth, they produced as much friction as was produced by other rock types. The harder rocks push against each other, the hotter they become; in other words, pressure itself, not only the rocks' properties, affects frictional heating. Geologists therefore wondered whether the friction between the plates was being reduced by pockets of pressurized water within the fault that push the plates away from each other.

The passage suggests which of the following regarding Henyey's findings about temperature in the San Andreas Fault?


A Scientists have yet to formulate a definitive explanation for Henyey's findings.

B Recent research suggests that Henyey's explanation for the findings should be modified.

C Henyey's findings had to be recalculated in light of Byerlee's 1992 experiment.

D Henyey's findings provided support for an assumption long held by geologists.

E Scientists have been unable to duplicate Henyey's findings using more recent experimental methods.
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 56244
Re: Prior to 1965 geologists assumed that the two giant rock  [#permalink]

Show Tags

New post 02 Oct 2018, 06:16
lostaish wrote:
Prior to 1965 geologists assumed that the two giant rock plates meeting at the San Andreas Fault generate heat through friction as they grind past each other, but in 1965 Henyey found that temperatures in drill holes near the fault were not as elevated as had been expected. Some geologists wondered whether the absence of friction-generated heat could be explained by the kinds of rock composing the fault. Geologists' pre-1965 assumptions concerning heat generated in the fault were based on calculations about common varieties of rocks, such as limestone and granite; but “weaker” materials, such as clays, had already been identified in samples retrieved from the fault zone. Under normal conditions, rocks composed of clay produce far less friction than do other rock types.

In 1992 Byerlee tested whether these materials would produce friction 10 to 15 kilometers below the Earth's surface. Byerlee found that when clay samples were subjected to the thousands of atmospheres of pressure they would encounter deep inside the Earth, they produced as much friction as was produced by other rock types. The harder rocks push against each other, the hotter they become; in other words, pressure itself, not only the rocks' properties, affects frictional heating. Geologists therefore wondered whether the friction between the plates was being reduced by pockets of pressurized water within the fault that push the plates away from each other.

The passage suggests which of the following regarding Henyey's findings about temperature in the San Andreas Fault?


A Scientists have yet to formulate a definitive explanation for Henyey's findings.

B Recent research suggests that Henyey's explanation for the findings should be modified.

C Henyey's findings had to be recalculated in light of Byerlee's 1992 experiment.

D Henyey's findings provided support for an assumption long held by geologists.

E Scientists have been unable to duplicate Henyey's findings using more recent experimental methods.


Discussed here: https://gmatclub.com/forum/prior-to-196 ... 32112.html
_________________
GMAT Club Bot
Re: Prior to 1965 geologists assumed that the two giant rock   [#permalink] 02 Oct 2018, 06:16
Display posts from previous: Sort by

Prior to 1965 geologists assumed that the two giant rock

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne