Multiple choice

Comets are made up of frozen gases like water, ammonia, _____and carbon dioxide.

  1. propane

  2. ethane

  3. butane

  4. methane
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Comets are icy bodies composed of frozen volatiles including water, ammonia, methane, and carbon dioxide. Methane (CH4) is the correct answer - it's a simple hydrocarbon found frozen in cometary nuclei alongside water ice. Propane, ethane, and butane are larger hydrocarbons not typically found as primary components of comets.

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