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A convergence is a situation where the winds…

  • A
    Transport more mass of air in than out.
  • B
    Flow together without changing the mass of air.
  • C
    Transport less mass of air in than out.
  • D
    Flow apart without changing the mass of air.

Refer to figure.
A Depression is a region of comparatively lower pressure than the surroundings.
As you can observe in the attached figure, in a LOW, air is converging at the surface (being sucked in at low level) and rising from the surface to higher altitude and, thereafter, diverging.

  • LOWs are regions of converging and rising air.

To make this question easier to understand, we can say that in a LOW the airflow is “inwards” towards the centre of the depression. Whilst in a HIGH, the airflow is “outwards” away from the centre of the HIGH.

Rotation of air (winds) around a LOW is:

  • Northern Hemisphere = inward and anti-clockwise,
  • Southern Hemisphere = inward and clockwise.

Rotation of air (winds) around a HIGH is:

  • Northern Hemisphere = outward from centre and clockwise,
  • Southern Hemisphere = outward from centre and anti-clockwise.

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