The air mass found in the area labeled 4 would be designated: 
Definitions:
Skill Development
Refers to the process of identifying, cultivating, and honing one's abilities and knowledge to improve competence and performance in various tasks.
Experiential Learning
An educational approach focused on learning through direct experience and reflection on doing.
Safe Environment
A setting or situation that provides security and protection, minimizing risks of harm or danger to individuals.
Open and Responsive
A characteristic of being willing to listen, adapt, and react positively to feedback, suggestions, and changes in the environment.
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Q111: The air mass source region labeled 1