Read this excerpt from exploring the titanic.
in 1979, off baja california, we made the most spectacular discovery of all the amazing black smokers. these underwater
vents belch out fluids hot enough to melt lead, and shoot them straight up from the ocean floor through chimneys of lava.
what are black smokers?
spouts in the ocean floor
a type of lead that is found in lava
vents that divers bring underwater
a nickname for fluids found underwater

i would say that these are the two thesis statements best for a literary analysis essay on recurring themes in shakespeare's romeo and juliet:

1.  in romeo and juliet, shakespeare demonstrates that love comes in a variety of forms, be it romantic, familial, or between friends.

2.  shakespeare explores the struggle for identity through the character of juliet in his play romeo and juliet.

the other theses aren't reoccurring in this play. 

explanation:

chapter i -- paris: september, 1792

a surging, seething, murmuring crowd of beings that are human only in name, for to the eye and ear they seem naught but savage creatures, animated by vile passions and by the lust of vengeance and of hate.

during the greater part of the day the guillotine had been kept busy at its ghastly work: all that france had boasted of in the past centuries, of ancient names, and blue blood, had paid toll to her desire for liberty and for fraternity.

hope this answer you: )!