/ˈɪgniəs ||; ˈɪgnɪəs/adj (
technical术语) (used about rocks 指岩石) formed when
MAGMA (= melted or liquid material from below the earth's surface) comes out of a
VOLCANO and becomes solid 火成的
☞Compare metamorphic and sedimentary. 与metamorphic及sedimentary比较。 ☞picture at rock 见rock插图