The Following Questions Refer to the Description and Figure Below

question 72

Multiple Choice

The following questions refer to the description and figure below.
The figure represents a cross section of the sea floor through a mid-ocean rift valley, with alternating patches of black and white indicating sea floor with reversed magnetic polarities. At the arrow labeled "I" (the rift valley) , the igneous rock of the sea floor is so young that it can be accurately dated using carbon-14 dating. At the arrow labeled "III," however, the igneous rock is about 1 million years old, and potassium-40 dating is typically used to date such rocks. Note: The horizontal arrows indicate the direction of sea-floor spreading, away from the rift valley.

Figure 25.1
-Assuming that the rate of sea-floor spreading was constant during the 1-million-year period depicted above, what should be the approximate age of marine fossils found in undisturbed sedimentary rock immediately overlying the igneous rock at the arrow labeled "II"?

• A) 10,000 years
• B) 250,000 years
• C) 400,000 years
• D) 1,000,000 years

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Definitions:

Personal Fable

An exaggerated sense of personal uniqueness and indestructibility, which may be the basis for adolescent risk taking.

Autonomy

The capacity to make an informed, uncoerced decision independently, often used in the context of moral, ethical, or self-governing practices.

Period of Rebellion

A phase, often in adolescence, characterized by increased resistance against authority and societal norms as a way of seeking individual identity.

Personal Fable

A belief held by adolescents that they are unique and invulnerable, often leading to risk-taking behaviors.