Limestone Sinkhole Used by Mayans for Sacrifices
Puzzle 5 of Hawaii Pack
Question is: Limestone Sinkhole Used by Mayans for Sacrifices
and the answer is: CENOTE
Word Meaning:
CENOTE — A deep natural well or sinkhole, especially in Mexico and Central America, formed by the collapse of surface limestone that exposes groundwater underneath, and sometimes used by the ancient Mayans for sacrificial offerings.
Definitions from Wiktionary.