Question

Describe pahoehoe, aa, and pillow lava.

Answer 1

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. ... Aa forms when lava flows rapidly.