GEOLOGY

Detailed explanation-1: -When volcanoes do produce lava flows they are classified as either Pahoehoe or Aa. The lava is identical in both pahoehoe and aa lava flows, the difference comes from the amount of lava erupted and the speed of cooling.

Detailed explanation-2: -lavas tend to be rough, jagged and with either a blocky or a rubbly/clinkery surface, both formed essentially by continuous breaking and reworking of the cooled outer surface of a lava flow ( Balance and Smith 1982).

Detailed explanation-3: -Lavas, particularly basaltic ones, come in two primary types: pahoehoe (pronounced ‘paw-hoey-hoey") and aa (pronounced “ah-ah"). Both names, like a number of volcanological terms, are of Hawaiian origin. A third type, pillow lava, forms during submarine eruptions.

Detailed explanation-4: -The viscosity of most lava is about that of ketchup, roughly 10, 000 to 100, 000 times that of water.