The pillow basalts in the photo below most likely formed ____________.
A) on dry land at a continental hotspot
B) underwater at a subduction zone
C) on dry land at a continental rift
D) underwater at a mid-ocean ridge

Question

The pillow basalts in the photo below most likely formed ____________. 
A) on dry land at a continental hotspot 
B) underwater at a subduction zone 
C) on dry land at a continental rift 
D) underwater at a mid-ocean ridge

Quizplus · Accepted Answer

Pillow basalts are volcanic rocks that form when lava erupts at mid-ocean ridges and cools quickly upon contact with seawater. The rapid cooling causes the lava to solidify into characteristic pillow-shaped structures.

The Pillow Basalts in the Photo Below Most Likely Formed