A Newer Theory About Desert Varnish Suggests It Does Not

question 37

Multiple Choice

A newer theory about desert varnish suggests it does not form from chemical constituents of the rocks on which it is found.Which of the following statements about the newer theory of the formation of desert varnish is NOT true?

• A) Cosmic rays (which tend to be absorbed by moisture-rich air masses over nondesert areas) reach the desert surfaces in sufficient amounts to trigger an alteration process that forms desert varnish.
• B) Bacteria are involved in the formation of desert varnish.
• C) The presence of both dust and dew are necessary for the formation of desert varnish.
• D) Rainfall disrupts the formation of desert varnish.

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