Respuesta :
It is true that a cay is a small, low island composed largely of coral or sand. It may be especially be found on the islands in Spanish America. That is a sandy island on a surface of a coral reef.
The answer is:
True.
The google definition of a cay is
"cay
/kā,kē/
noun
noun: cay; plural noun: cays
a low bank or reef of coral, rock, or sand."