Question

what is an unconformity?
a surface where new rock layers meet a much older rock surface beneath them.
a process where rock layers are flipped upside down by pressure.
a type of rock formed by powerful forces inside the earth.
a natural process where older rock layers are lost to erosion.

Explanation:

An unconformity is a gap in the geologic rock record that appears as a surface separating younger rock layers from significantly older underlying rock layers, representing a period of erosion or non-deposition. The correct option matches this definition.

Answer:

A surface where new rock layers meet a much older rock surface beneath them.