SCORIA • E-FREE TRANSLATION.COM • Definition of Scoria

... farming; and elsewhere roots were being sown. The soil is prepared by a process called marnage, i.e. dug up to the extent of three feet, the marne or clayey soil being brought to the surface. A very valuable manure is that of the scoria or residue of dephosphated steel, formerly thrown away as worthless, but now largely imported from Hungary for agricultural purposes. Nitrate is also largely used to enrich the soil. Sixty years ago the Pas-de-Calais possessed ...

— In the Heart of the Vosges - And Other Sketches by a "Devious Traveller" • Matilda Betham-Edwards

... had I not forced him to repay me he would have asked for more. At last, after an abominably bad night's travelling, we climbed up a flight of huge steps cut in black basalt. My companions pressed on eagerly, speaking not a word. We passed through a lane of black scoria, with ...

— The World's Greatest Books, Volume 19 - Travel and Adventure • Various