People per Square Kilometer

Is it Physiological density or arithmetic density ?

What are the answers for the following questions?

What is the difference between the formation and characteristics of intrusive igneous rock and extrusive igneous rock?

How did the environment influence settlement patterns in colonial america? * 1 point a. early settlers stayed near rivers for farmland and transportation b. early settlers stayed in hilly areas to avoid frequent floods in coastal areas c. early settlers quickly moved to the mountains to avoid hot summers d. early settlers only lived on coastal islands to prevent indian attacks