lava basaltica 26
The basaltic columns ( or basalt Colonnade or basaltic bodies ) they are regular pillars more or less vertical, shape of polygonal prisms ( predominating hex ) formed by the rock during cooling break relatively slow basaltic lava in some lava flows, volcanic chimneys or boilers that fail to overflow or empty suddenly, by what its cooling happens on-site. These breaks are a special case of also called columnar disjunction. Besides in basalts, can be also columnar disjunction, although of less frequently, about other volcanic rocks from the cooling of lavas of different chemical composition, such as andesites, 1 dacitas2 and riolitas.3