Robert Ballard quote ✍️

Quote

I'm a geophysicist and all my earth science books when I was a student, I had to give the wrong answer to get an A. We used to ridicule continental drift. It was something we laughed at. We learned of Marshall Kay's geosynclinal cycle, which is a bunch of crap.
Section of a curve
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A
?
R
?
C
Hint 1 meaning
The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night.
Hint 2 anagram
RAC
Hint 3 another clue
AID WHEN GOING TO COURT
5 +1

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