What do the lines making a circle around the low-pressure area indicate?
missing metadata

a.
an occluded front

b.
areas of equal altitude

c.
areas of equal pressure

d.
a stationary front

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The circles indicate the pressure ratio in that particular area. Thus, the correct alternative is letter c) areas of equal pressure.

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Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.

Answerair masses develop near the equator are warm; tropical air mass