Layers of rocks outcropping on one side of a highway are the same as the layers of rocks outcropping on the other side of the highway, despite a distance of 1000 m.  To determine age relationships, which principle best explains this example?

A guide fossil has some or all of the following desirable characteristics except:

A fossil’s “range” determines:

An example of a period on the geologic time column is:

An example of a time unit is:

This unit comes before “Paleogene”

This unit comes after “Ordovician”

Atoms with unique atomic weights are called:

abduction is movement in the frontal plane, away from the body

The pectoralis major