Relative ages expressed on the geologic time scale primarily resulted from the study of
A) fossil content and spatial relationships among igneous rocks.
B) fossil content and spatial relationships among sedimentary rocks.
C) radiometric dating of igneous rocks.
D) radiometric dating of sedimentary rocks.

Question

Quizplus · Accepted Answer

Relative ages are determined by studying the fossil content and spatial relationships among sedimentary rocks. This is because sedimentary rocks are formed through the accumulation of sediments over time, and fossils are often found within these layers, allowing scientists to determine the relative order of events. Igneous rocks can also be used to determine relative ages, but only in relation to other igneous rocks, as the fossils necessary for dating are usually absent. Radiometric dating is used to determine absolute ages, not relative ages.

Relative Ages Expressed on the Geologic Time Scale Primarily Resulted