An HII Region Is

question 24

Multiple Choice

An HII region is

• A) a zone around a hot star where hydrogen atoms are ionized
• B) a place where there is mostly neutral hydrogen whose spectral lines we observe
• C) a cloud of dark dust, which absorbs much of the starlight coming from behind it
• D) one of the large and cold molecular clouds where we see star formation going on
• E) a cloud of complex molecules, such as alcohol and formaldehyde

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Definitions:

Query

A request for information from a database meeting specified conditions.

Parameter Query

A type of database query that requires the user to provide one or more criteria values to filter the results when the query is run.

Dialog Box

A small window that appears in a graphical interface asking the user to provide data input or make a choice.

Field Criteria

Conditions or requirements specified in a database query that determine which records to select or retrieve.