scoria

how planted upon this once scraggy scoria of a country?

Some of the interior valleys are strewed with scoria and broken stones, evidently of volcanic origin; the surrounding rocks bear the like character, and vestiges of extinguished craters are to be seen on the elevated heights.

The path coiled down abruptly into a narrow ravine between two tumbled and knotty masses of blackish scoria. Into this we plunged.

Of the total domestic crushed stone produced in 2018, about 68 percent was limestone and dolomite; 15 percent, granite; 6 percent, traprock; 5 percent, miscellaneous stone; 4 percent, sandstone and quartzite; and the remaining 2 percent was divided, in descending order of tonnage, among marble, volcanic cinder and scoria, calcareous marl, slate, and shell.

Not all moai have pukao, and for their study, the researchers looked at 3D models of 50 pukao spread across the Pacific island, as well as 13 red scoria (the material of which the pukao are made) cylinders at a site called Puna Pau, the island's quarry where the pukao were made.

An additional 8,000 fischer frame fixings FUR and 17,000 frame fixings SXRL affixed the rear-ventilated facade in concrete and Scoria bricks at the Olympic stadium in Sochi, which was rebuilt on the occasion of the world cup.

"Our porous PEEK Scoria technology features a porous architecture that seamlessly transitions to solid PEEK," said Chris Lee, CEO of Vertera Spine, an Atlanta, Ga.-based provider of spinal products and materials.

Covering some 180,000 square km, they contain tuff rings, lava domes, lava flows, scoria cones and more.

The lightweight scoria aggregates can be utilized to reduce the earthquake acceleration by producing structural lightweight aggregates.