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?

The deformation described in the article results from which type of stress?

The crust in the Basin and Range Province of Nevada, Utah, and Arizona is stretching; therefore, fault movement in this region must be:

You’re looking at a fault trace in the field. You observe a polished surface, with linear grooves on it, and fine powder along it. In more technical terms, what are you seeing?

Identify the FALSE statement. Mountains don’t get infinitely high or exist forever because:

Identify the structure that makes this pattern of rock layers on the ground surface: parallel stripes, showing bilateral symmetry across a mid-line (hinge), with rock getting older as you move outward from the hinge. 

If you see small, angular fragments of shattered rock along a linear boundary between two masses of rock, you must be looking at:

Which of the following statements is FALSE? This diagram showsClick to view larger image.