| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Extrusive rocks | Geography | A term applied to that class of igneous rocks derived from magmas or magmatic materials poured out or ejected at the earth's surface (i. e. volcanic rocks), as distinct from so-called intrusive or plutonic rocks that are injected at depth. Source: European Union. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
