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In regions when there is a net outflow of air, a situation referred to as :

  • A.Convergence
  • B.Advection
  • C.Convection
  • D.Divergence

Answer: D

A net outflow of air is called Divergence.

Where more air leaves a region than enters it, the air is diverging. At the surface this happens under high pressure, where sinking air spreads out; in the upper troposphere divergence above a low draws air up from below.

Convergence is the opposite, a net inflow of air. Advection is horizontal transport of a property such as heat or moisture by the wind, and convection is vertical transfer of heat by rising and sinking air, so neither names a net outflow.

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