The geologic time scale originally ordered Earth's rocks by:

A. absolute age
B. relative age***
C. composition
D. decades and centuries

Where did scientists originally get their information to develop the geologic time scale?

A. They collected and studied rock samples in Europe
B. They studied rock layers and index fossils around the world****
C. They conducted research at libraries
D. They didn't have any information; they just made an educated guess

Which of the following is the longest division of geologic time?
A.period
B.Epoch
C.Era****
D.Year
(I chose C, I know the real answer is EON but it's not an answer choice soo...)

4. Geologists divide Earth's long history into smaller units that make up the geologic time scale?

True***
False