Question

step 11 in figure above is the __________. fault fold brown layer nonconformity angular unconformity red layer pink layer disconformity

Explanation:

A nonconformity is a type of unconformity where sedimentary rocks lie on top of igneous or metamorphic rocks. In the given geological cross - section, if step 11 represents the boundary between an eroded igneous/metamorphic rock (like the granite - looking rock at the bottom) and the overlying sedimentary layers, it fits the definition of a nonconformity.
A fault is a fracture with displacement. A fold is a bent rock layer. Angular unconformity has tilted sedimentary layers below and horizontal above. Disconformity is between parallel sedimentary layers with an erosional gap. The brown, red, and pink layers are just color - coded sedimentary or igneous layers (the red might be an intrusion).

Answer:

Nonconformity