Question

Obsidian is formed when rapidly cooling ions are randomly distributed, creating a _____ texture.

fine-grained

coarse-grained

glassy

porphyritic

Answer 1

Obsidian is formed when rapidly cooling ions are randomly distributed, creating a _____ texture.

Glassy

Answer 2

glassy

Step-by-step explanation:

Obsidian is a type of an igneous rock which is formed by the rapid cooling of molten lava. It commonly occurs as a black solid with a glassy texture and is primarily composed of 70% silicon dioxide (SiO2) and some form of iron oxide.

Obsidian is formed when rapidly cooling ions are randomly distributed, creating a glassy texture.