Question

which statement best describes the principle of superposition?
a. species change over time.
b. younger rock layers form on top of older rock layers.
c. older rock layers form on top of younger rock layers.
d. an igneous dike existed before the rock layers that formed above it.

Explanation:

The principle of superposition states that in undisturbed sedimentary rock layers, younger layers form on top of older layers. Option A is about evolution (not superposition). Option C is the opposite of the principle. Option D is about cross - cutting relationships (not superposition).

Answer:

B. Younger rock layers form on top of older rock layers.