Stalagmites Can Be Radiometrically Dated Because

question 56

Multiple Choice

Stalagmites can be radiometrically dated because

• A) like tree rings, the calcium carbonate layers vary in thickness by year.
• B) carbon-14 decays to nitrogen 14 in the carbonate.
• C) uranium-234 substitutes for calcium and decays to thorium-230.
• D) fission tracks in apatite in the structures can be dated.

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Definitions:

Dopamine

A neurotransmitter in the brain associated with pleasure, movement, and the reward system, influencing mood and behavior.

Neurotransmitter

Chemical substances in the nervous system that transmit signals between neurons.

Dopamine

A neurotransmitter involved in a number of functions, including mood, sleep, learning, and the reward system, often linked to feelings of pleasure and satisfaction.

Parkinsonism

A syndrome characterized by tremor, bradykinesia, rigidity, and postural instability, often associated with Parkinson's disease but can be caused by other conditions as well.