The scum formed by oxidation at the surface of molten metals.
1The practically trained eye could see the scoria which indicates the defective welding.
2We climb mountains over scoria that frays and lava that burns.
3Crater Lake, with Wizard Island, a post-caldera collapse basaltic scoria cone.
4Rings of pale-coloured scoria may be due to tin, zinc, antimony, or arsenic.
5We passed through a lane of black scoria, with steep banks on both sides.
6On approaching nearer the apex, the path was over cinders, fine black sand, and scoria.
7His followers dug straight down into red volcanic scoria.
8These buildings are of the dark grey scoria, almost imperishable I suppose, and look very well.
9Cinder cones are like giant anthills of scoria.
10Now red scoria and pumice and sulphur boiled and rolled where the hard lava had frayed our boots.
11To the south lay broken shapes of scoria in a lava bed as far as the eye could see.
12The headlong, stammering, vivid man had made a mistake-thefat, unwieldy, diamond-heartedcreature, all crusted with slag and scoria.
13The cone which rises from its center is remarkably regular, and consists for the most part of cinders and scoria.
14Ima Itikarai also warned of the potential for mud slides given the ash and scoria fall mixing with current heavy rains.
15The second phase was more dominated by lava flows making the island larger and growing what we call a scoria cone.
16Two villages on the south-east of the island were showered in scoria rocks of 2 centimetres in diameter Mr Itikarai said.