In "The Cay," what is a hard substance made up of tiny sea animals skeletons?It is answered near the part wear Phillip went into the hole.

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gbeatty | College Teacher | (Level 1) Educator Emeritus

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That's coral. For more on how coral is formed, you might visit the website indicated below:

 

http://library.thinkquest.org/25713/reefs_made.html

 

Sources: