What Is the Relationship Between a Giant Molecular Cloud and an H

question 318

Multiple Choice

What is the relationship between a giant molecular cloud and an H II region?

• A) They are two names for the same entity.
• B) In giant molecular clouds, H II regions surround ultraviolet-emitting stars (types O andB), which have ionized the hydrogen around them.
• C) In H II regions, giant molecular clouds are concentrations of other molecules like CO and H₂O.
• D) Giant molecular clouds evolve into H II regions as the molecules other than hydrogen are used up in star formation.

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