What Was the Most Convincing Evidence That a Natural Nuclear

question 3

Multiple Choice

What was the most convincing evidence that a natural nuclear reactor formed two billion years ago in a uranium deposit in Africa?

• A)the relative depletion of ²³⁵U in the deposit
• B)the relative depletion of ²³⁸U in the deposit
• C)the relative abundance of lead in the deposit
• D)the isotopic distribution of neodymium in the deposit
• E)the appearance of radiation damage in the surrounding rock

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Definitions:

Fixation

According to Freud, a condition in which the id, ego, and superego do not mature properly and are frozen at an early stage of development.

Libido

The sexual energy that fuels the id.

Sexual Energy

The vitality and enthusiasm related to sexual feelings and activities, often considered as a driving force of creativity and relationship dynamics.

Id

According to Freud, the psychological force that produces instinctual needs, drives, and impulses.