Folded Sheets of Volcanic Rock on Hawaii
Puzzle 16 of New Orleans Medium Pack
Question is: Folded Sheets of Volcanic Rock on Hawaii
and the answer is: PAHOEHOE
Word Meaning:
PAHOEHOE — A form of lava flow of basaltic rock, usually dark-colored with a smooth or ropey surface. It is one of two chief forms of lava flow emitted from volcanoes of the Hawaiian type, the other form being aa.
Definitions from Wiktionary.