I just need the 4th question. What problems are inherent in trying to classify places into regions?

What is the approximate chemical composition of the solar nebula?

When geographers describe how two places are related to each other spatially, they are describing a. where the places are located in relation to one another b. what kinds of natural environments are around each place c. how each place is changing over time d. what kinds of cultures are in each place

Where does the availability of water pose the greatest problem