differential weathering

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the difference in degree of discoloration, disintegration, etc., of rocks of different kinds exposed to the same environment.

QUIZZES

Set some time apart to test your bracket symbol knowledge, and see if you can keep your parentheses, squares, curlies, and angles all straight!

Question 1 of 7

Let’s start with some etymology: What are the origins of the typographical word “bracket”?

He majored in mathematical physics, studying mind-bending theories of quantum mechanics and partial differential equations.
How the NSA Became a Killing Machine|Shane Harris|November 9, 2014|DAILY BEAST
Tiebreakers are goal differential, greatest number of goals scored, and, further down, the drawing of lots.
USA vs. Germany World Cup Primer: Everything You Need to Know About the Epic Showdown|Marlow Stern|June 26, 2014|DAILY BEAST
Then, the U.S. and Portugal would be tied in points, goal differential, and goals scored.
USA vs. Germany World Cup Primer: Everything You Need to Know About the Epic Showdown|Marlow Stern|June 26, 2014|DAILY BEAST
That differential accounted for about 60 percent of the downward revision.
How Obamacare Helped Crash the Economy|Daniel Gross|June 25, 2014|DAILY BEAST

The efforts are proceeding slowly and tentatively because the price differential of the fuel is only one factor to consider.
Diesel Trains May Soon Use Natural Gas Instead|The Daily Beast|May 27, 2014|DAILY BEAST
A record is generally kept of the number of nucleated red cells seen during a differential count of leukocytes.
A Manual of Clinical Diagnosis|James Campbell Todd
The differential count is best made upon a film stained with Wright's, Jenner's, or Ehrlich's stain.
A Manual of Clinical Diagnosis|James Campbell Todd
Jenner's stain, which gives a somewhat similar picture, is preferred by many for differential counting of leukocytes.
A Manual of Clinical Diagnosis|James Campbell Todd
The principal source of the irregularities was found in the concealed upper differential wheel of the Grubb slow motion.
Photographs of Nebul and Clusters|James Edward Keeler
You,” said I. “You drive a nail as if it were an abstruse problem in differential calculus.
The Idyl of Twin Fires|Walter Prichard Eaton