Which of the following accurately ranks the subdivisions of geologic time in order from largest to smallest?

Identify the FALSE statement. William Smith’s observations:

Uniformitarianism:

In a “nonconformity” the rock layers are parallel above and below the unconformity.

The four columns in this diagram represent fossil-bearing sedimentary rock layers at four different sites. The sedimentary layers are continuous except at the zigzag lines, which represent unconformities. Compare the sites, determine the relative ages of the fossils, and then identify the FALSE statement.Click to view larger image.

Which of the following shows the four time divisions listed from oldest to youngest?

Which of the following methods of determining the age of materials is a radiometric dating technique?

The time it takes for one quarter of a group of a radioactive element’s isotopes to decay is called the “half life.”

Which of the following statements is FALSE? The principle of:

A radioactive isotope of the element potassium decays to produce argon. If the ratio of argon to potassium is found to be 7:1, how many half-lives have occurred?