Why is life so hard...

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

What property does soil or rock need to be permeable? a.)young b.)old c.)non porous d.)porosity

Which area of the mind works based on the reality principle? id ego superego conscience