Discussion
If the isobars and isopycnals are parallel to each other, the flow is said to be
Answer: B
The flow is barotropic.
In a barotropic fluid the density depends only on pressure, so surfaces of constant pressure (isobars) and constant density (isopycnals) coincide or are parallel. In a baroclinic fluid they intersect, because density also depends on temperature or salinity; this gives the solenoidal term that generates vertical shear (the thermal wind).
Geostrophic describes a balance between pressure gradient and Coriolis forces, which can hold in either case, and rotational refers to vorticity, not to the relation between pressure and density surfaces.
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