The study of speech sounds in language or a language with reference to their distribution and patterning and to tacit rules governing pronunciation. 2. The sound system of a language: the phonology of English. phoÂ·noÂ·logâ²ic (fÅâ²nÉ-lÅjâ²Ä­k) , phoâ²noÂ·logâ²iÂ·cal (-Ä­-kÉl) adj.
What does a porphyritic texture indicate about the history of an igneous rock? the magma sat and cooled a bit below the Earth's surface, thus giving time for the large crystals to grow, before erupting onto the surface and cooling very quickly
1 Igneous Rocks â Lava Textures Lava is an EXTRUSIVE form of Igneous Activity It represents molten rock that has been erupted or extruded onto the earthâs surface from volcanoesLava generally cools quickly (overmonths/years/decades) depending on the thickness of the flow.2  2. Lava Textures-aa Aa lava has a surface made of sharp, angular and jagged blocksof basalt. 2  The cooled surface layer breaks up into these fragments as molten lava continues to flow beneath. 3  8.