extrusive -- Igneous. Antonym of intrusive.
fault -- n. (v.) A fracture, or large crack, in the Earth's crust where one side moves up/down/sideways relative to the other; fault block- n.
extrusive Pertaining to igneous rocks or features formed from lava released on the Earth's surface.
facies see metamorphic facies , sedimentary facies ...
An extrusive igneous rock that develops from a magma that is chemically between felsic and mafic and whose mineral crystals are fine.
Andisols ...
A dark-colored fine-grained extrusive igneous rock composed largely of plagioclase feldspar and pyroxene. Similar in composition to gabbro. Basalt is thought to be one of the main components of oceanic crust.
Base Flow: ...
Vegetation is shown in orange; basalts in gray; silicic extrusives in pinkish-orange.
 See also: Soil, Igneous rock, Surface, Plate, Sediment
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