"06121375-n"^^ . . "petrology"@en-us . . . . . . "106121375"^^ . "0"^^ . . . . "the branch of geology that studies rocks: their origin and formation and mineral composition and classification"@en-us . "105755411"@en-us . "lithology"@en-us . . "0"^^ . "petrology"^^ . .