Use "scoria" em uma frase

1. Whence came they? how planted upon this once scraggy scoria of a country?

2. The products of volcanoes bear no similarity of origin, or kindred resemblance to meteoric stones; those are lavas of different kinds, pumicestone, scoria, ashes, &c

3. — in scoria, Wollaston's mode of detecting, xix, 188