An unconformity is a of rock.

Answer;

-Missing layer

An unconformity is a Missing layer of rock.

Explanation;

-Unconformity is a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time. The missing unit of rock is called an unconformity, defined as a period of either non-deposition or erosion separating two stratigraphic units of rock with different ages.

-There are three types of unconformity which are; disconformity, Nonconformity, Angular unconformity. Disconformity  is sequence of parallel rock is missing. It is hard to see but very common. Nonconformity is a sedimentary rock layers lie on top of an eroded surface of a non-layered igneous or metamorphic rock. Layers are on top of non-layered rock. Angular unconformity exists between horizontal rock layers and eroded tilted or folded rock layers. The tilted or folded layers were eroded before horizontal layers formed above them.

cells spend most of their time in interphase