Why Does Iron, When Added to Quartz, Cause the Purple

question 66

Multiple Choice

Why does iron, when added to quartz, cause the purple color of amethyst?

• A) The presence of trace constituents can affect color.
• B) Iron overpowers the silicon in quartz.
• C) Amethyst is formed under extremely hot conditions.
• D) Iron is red and silicon is blue, making purple.

Grasp the concept of sensory, motor, and interneurons in transmitting information within the nervous system.

Recognize the physiological and psychological effects of neurotransmitter undersupply and oversupply.

Understand the process of how neurotransmitters and neurons enable the body's response to pain and stimuli.

Learn the role of neurotransmitters in psychological disorders such as schizophrenia.

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