Which statement about how geologists study the ages of rock layers is true? a. the law of superposition means that older rocks are on top. b. geologists can find the exact age of a rock by looking at its relative position. c. the principle of original horizontality provides the basis for the law of superposition. d. relative age can be determined by using the concept of unconformity. (earth science)

The correct answer is: The principle of original horizontality provides the basis for the law of superposition.

The principle of original horizontality stated that all rock layers were originally horizontal (in sedimentary rocks). This principle set the ground for Geologists to figure out The law of superposition which states that the youngest layer is on top and the oldest is on bottom in any sequence of sediments and rocks.

The answer is C

Explanation:

the answers are a b and d