What Are Comets Made Of

question 52

Multiple Choice

What are comets made of?

• A) Silicates and rocky dust
• B) Metallic dust particles
• C) Dark colored complex hydrocarbons
• D) Methane, ammonia, and water ice
• E) All of the above

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Definitions:

Impulsivity

Tendency to act on a whim, displaying behavior characterized by little or no forethought, reflection, or consideration of the consequences.

Sympathetic Nervous System

Part of the autonomic nervous system that prepares the body for physical activity by accelerating the heart rate, constricting blood vessels, and raising blood pressure.

Parasympathetic Nervous System

The part of the autonomic nervous system responsible for rest and digestion, often counterbalancing the sympathetic nervous system's "fight or flight" response.

Midbrain

A portion of the brainstem involved in vision, hearing, motor control, sleep/wake, arousal (alertness), and temperature regulation.