Question

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the area over which an air mass forms is called a(n)
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Explanation:

An air mass is a large body of air with relatively uniform temperature and humidity. The region where it forms, having similar surface properties (like temperature and moisture), is named a source region. This term is specific in meteorology (a sub - field of Natural Science, specifically Geography related to atmospheric studies) to denote the origin area of an air mass.

Answer:

source region