The wind is described as geostrophic when:

a the pressure gradient force balances the centripetal force.
b winds blow in a straight line parallel to contour lines on a weather map
c the pressure gradient and coriolis forces act on the air in the same direction.
d winds blow under the influence of only the pressure gradient force.

B Winds blow in a straight line parallel to contour lines on a weather map

Explanation:

Geostrophic Wind -

It is the pattern of the wind , when the flow of wind is exactly parallel to the contour lines of the weather map .

It is a theoretical wind which results from the balance between the pressure gradient force and the Coriolis force .

Hence , the correct description for the Geostrophic Wind is option ( b ) .

italy:

classic, nostalgic, romantic and beautiful. no place better than italy or sicily.

helen told me that she hoped i had enjoyed myself.