Which of the following igneous rocks is NOT characteristic of mid-ocean ridges?
A) finely crystalline rocks that formed in dikes
B) gabbro that solidified in a magma chamber
C) pillow basalt
D) andesite and granodiorite

Question

Quizplus · Accepted Answer

Andesite and granodiorite are not characteristic of mid-ocean ridges; they are more commonly associated with volcanic arcs related to subduction zones, not the spreading centers found at mid-ocean ridges. Mid-ocean ridges typically feature basaltic compositions, such as pillow basalts, and gabbros from the cooling of magma chambers.

Which of the Following Igneous Rocks Is NOT Characteristic of Mid-Ocean