flows. Hawaiian eruptions are often extremely long-lived; Pu?u ?O?o, a cinder cone of Kilauea, erupted continuously from January 3, 1983, until April 2018.

Flows from Hawaiian eruptions can be divided into two types by their structural characteristics: pahoehoe lava which is relatively smooth and flows with a ropey texture, and ?a?a flows which are denser, more viscous (and thus slower moving) and