Basaltic lavas that solidify at the surface before flow ceases fracture irregularly,producing a sharp-surfaced lava rock named ____________.
A)pahoehoe
B)aa
C)pumice
D)hyaloclasite

Question

Quizplus · Accepted Answer

Basaltic lavas that solidify at the surface before flow ceases and fracture irregularly produce a sharp-surfaced lava rock named aa. Pahoehoe is a smooth-surfaced lava rock resulting from a more fluid lava flow. Pumice is a light volcanic rock formed from the solidification of frothy lava. Hyaloclastite is a rock formed by the rapid cooling and solidification of hot rock fragments in water or ice.

Basaltic Lavas That Solidify at the Surface Before Flow Ceases