Review and define the factors that make people migrate. how do push/pull factors come into play?

Why are radio observatories located in valleys far away from urban centers? a. to shield them from electromagnetic interference b. to avoid sound pollution c. to avoid disturbing people living in the city d. to shield them from water vapor

Which of the following properties of a soil sample most influences the flow of water through the sample a. colorb. fertilityc. permeability d. phe. salinity

Territorial insects like spiders that fight off intruders would be expected to be a) regularly distributed b) randomly distributed c) clustered together d) b and c e) selectively distributed