Asurface of erosion on metamorphic or igneous rocks below sedimentary rocks is a(n): oa) nonconformity. ob) disconformity. oc) angular unconformity. od) anticonformity. oe) none of the above

Nonconformity

Explanation:

There are four different types of unconformity

Nonconformity is when there is an erosional surface on a metamorphic or igneous rock and we find sedimentary rocks (layers) over them

Disconformity is between sedimentary rocks that are divided by a surface of erosion and the have the same attitude

Angular unconformity is also between sedimentary rocks divided by an erosional surface, the difference here is that the have different attitude

Paraconformity Between sedimentary rocks without erosional surface and same attitude, the explanation is that there was a period withput deposition and without erosion

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.