Sentences with phrase «raw volcanic material»
The raw volcanic material of central Idaho lies over the slopes in haphazard heaps.
http://discovermagazine.com/ Not exact matches
The chemistry of obsidian varies from volcano to volcano, and the chemical «fingerprints» allow researchers to match an obsidian artefact to the volcanic origin of its raw material.
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.
The use of natural materials such as volcanic stones, raw teak, timber and slate pay homage to the building traditions of the island.