What two rock types are often found interlayered in the same volcanic deposit?
A) obsidian and pumice
B) andesite and komatiite
C) granite and gabbro
D) peridotite and basalt

Question

Quizplus · Accepted Answer

Obsidian and pumice are often found interlayered in volcanic deposits because they both originate from the rapid cooling of high-silica lava. Obsidian forms when the lava cools so quickly that no crystals can form, resulting in a glassy texture, while pumice is created when gas bubbles are trapped in the cooling lava, giving it a porous structure.

What Two Rock Types Are Often Found Interlayered in the Same