In central Iowa, which one of the following would yield the highest UV exposure on a sunny day, with a sky clear of all clouds and apparent pollution? Thirty minutes of direct exposure to the sun

A) at 1:00 PM on June 30.
B) at 3:00 PM on September 30.
C) at 9:00 AM on December 1.
D) at 2:00 PM on March 30.


A

Environmental & Atmospheric Sciences

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