Discussion
Winds that blow of a constant speed parallel to curved isobars are termed as :
Answer: A
They are gradient winds.
The gradient wind blows parallel to curved isobars at constant speed, with the pressure gradient force, Coriolis force and centrifugal force in balance. It is a good approximation of the wind above the friction layer around highs and lows.
The geostrophic wind also blows parallel to the isobars, but only where they are straight, from a balance of pressure gradient and Coriolis forces alone. The thermal wind is the vertical shear of the geostrophic wind caused by horizontal temperature gradients, not an actual wind. 'Hydrostatic' describes the vertical balance between gravity and the vertical pressure gradient, not a horizontal wind.
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