On a weather map, what do isobars placed close together indicate?

A steep pressure gradient ( where isobars are close together) indicate higher winds, a less steep pressure gradient (where isobars are farther apart) indicate slower air movement. ... Be able to interpret a weather map that shows the distribution of air pressure and wind flags.

I'm pretty sure it's c. extremely gradual but not 100% sure though.

Answer (d) may increase or decrease porosity through dissolution or deposition;