Basaltic lavas that solidify at their surface (before ceasing to flow)fracture irregularly,producing a sharp-surfaced lava rock named ____________.
A) pahoehoe
B) a'a'
C) pumice
D) hyaloclasite

Question

Quizplus · Accepted Answer

Basaltic lavas that solidify at their surface before stopping their flow fracture irregularly, producing jagged-surfaced lava rock called a'a'. Pahoehoe has a smooth, ropy texture and is typically formed by lava that is still flowing. Pumice is a volcanic rock that is formed from explosive eruptions and is characterized by its porous and lightweight properties. Hyaloclastite is a type of volcanic rock that forms from the quenching of hot volcanic glass in seawater.

Basaltic Lavas That Solidify at Their Surface (Before Ceasing to Flow)fracture