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?

Uniformitarianism:

You should be able to number the events in the accompanying figure in the proper order of occurrence. If the first (oldest) event is number 1, and the last (most recent) is number 8, which occurred fifth in the sequence?Click to view larger image.

Identify the FALSE statement. Radiometric dating:

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

Orogeny is a mountain building event.

Which of the following conditions will tend to make rocks change by ductile deformation rather than by brittle deformation?

Why might others be interested in this investigation?

Identify the TRUE statement. The San Andreas fault:

Identify the FALSE statement. The reference geoid does not completely represent an accurate picture of Earth’s gravity because: