Source region(s) for air masses are where winds are and the surface is
middle latitudes, strong, rough terrain subarctic and subtropical, light, flat

middle latitudes, light, surface is flat

Explanation:

Hello, great question. These types are questions are the beginning steps for learning more advanced Algebraic Equations.

According to Geographical studies , source region(s) for air masses are middle latitudes where winds are light and the surface is flat. They then move and collide with winds from other areas and create interesting weather effects.

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this is poiselle's equation from fluid mechanic in physics. mech eng