How do i give branlyist?

How do earth’s systems interact with each other?

Can someone answer this question without telling me to try my best if i don’t finish my flvs work will i not be able to move to the next grade

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