Rock Used for the Outside of the Great Pyramid
Puzzle 10 of Wonderful Sights Pack
Question is: Rock Used for the Outside of the Great Pyramid
and the answer is: LIMESTONE
Word Meaning:
LIMESTONE — An abundant rock of marine and freshwater sediments; primarily composed of calcite (CaCO₃); and occurring in a variety of forms, both crystalline and amorphous.
Definitions from Wiktionary.