Sentences with phrase «hard volcanic stone»

, would not be nearly enough to carve these colossal figures out of the steel - hard volcanic stone with rudimentary tools; and the island is so small that it could scarcely have provided food for more than 2,000 people.

Not exact matches

Morgan and University of Liverpool archaeologist Natalie Uomini arrived at their conclusions by conducting a series of experiments in teaching contemporary humans the art of «Oldowan stone - knapping,» in which butchering «flakes» are created by hammering a hard rock against certain volcanic or glassy rocks, like basalt or flint.

Obsidian, naturally occurring volcanic glass, is smooth, hard, and far sharper than a surgical scalpel when fractured, making it a highly desirable raw material for crafting stone tools for almost all of human history.

Granite A popular countertop choice because of its appearance and durability, granite is a siliceous stone made from an extremely hard volcanic rock.