For an area to be considered “urban” in the united states, it needs to have at least people per square mile. a. 400 b. 1,000 c. 5,000 d. 8,000

the answer is: B. 1,000

An area can be considered as 'urban' if it's located near industrial area and obtain enough human labors to accommodate the industries near it, According to united states government, an industrial area need approximately around 1000 potential human labors per square mile at its disposal.

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.