Question

the principle of ____ states that in a sequence of sedimentary rock layers, the oldest is at the bottom and the youngest is at the top.
a superposition
b cross - cutting relationships
c lateral continuity
d faunal succession

Explanation:

The question describes the principle that in sedimentary rock layers, older layers are at the bottom and younger ones at the top, which is the definition of superposition.

Answer:

a. Superposition