The diagram below shows some activity at a mid-ocean ridge.

Question

Which of the following best describes the process shown in the diagram?
A.
Tectonic plates move closer to each other, which forms magma.
B.
Solid rock liquefies as it reaches the surface and flows outward.
C.
Tectonic plate motion forces magma downward.
D.
Magma moves upward and crystallizes, forming new rock.

Answer 1

The best description of the process shown at a mid-ocean ridge is:

D. Magma moves upward and crystallizes, forming new rock.

At mid-ocean ridges, tectonic plates are diverging, allowing magma from the mantle to rise to the surface, where it cools and solidifies to form new oceanic crust.