In 1990, what was the population density near chicago?

a.
6 or fewer people per square mile

b.
18-45 people per square mile

c.
45-90 people per square mile

d.
90 or more people per square mile

D.  90 or more people per square mile

Explanation:

Chicago and its surrounding areas have always been known to be well populated. Chicago is a business hub and one of the business capital of the United States. Job opportunities, career growth, social infastructure, industries, markets e.t.c has driven a lot of people en-masse from all over the world to Chicago and its environs.

As at 1990, the population density near Chicago was already on the high side pegged at an estimate of about 90 or more people per square mile.

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.

landlessness of ordinary people

^^something like that^^^