The topic pahoehoe is discussed in the following articles:     •
TITLE: lava (volcanic ejecta)     Mafic (ferromagnesian, dark-
coloured) lavas such as basalt characteristically form flows
known by the Hawaiian names pahoehoe and aa (or a’a). Pahoehoe
lava flows are characterized by smooth, gently undulating, or
broadly hummocky surfaces. The liquid lava flowing beneath a
thin, still-plastic crust drags and wrinkles it into tapestry-
like folds and rolls resembling twisted...   • TITLE: volcano
(geology)     SECTION: Lava flows   • TITLE: volcano (geology)
SECTION: Determinants of size and shape  formation of lava tubes
• TITLE: cave     SECTION: Lava tubes     ...They are the
channels of rivers of lava that at some earlier time flowed
downslope from a volcanic vent or fissure. Lava tubes develop
best in highly fluid lava, notably a basaltic type known as
pahoehoe. They rarely form in rough, clinkery aa flows or in the
more massive block lavas. In pahoehoe flows volatile components
remain in solution in