When a geographervstudies the migration patterns of humans over many centuries and how that has effected the geography of North America which theme of geography is he or she using ?

Chris lives in a city that experiences heavy rainfall with average annual precipitation of 882 millimeters. it is warm all year.mark lives in city with an average annual rainfall of 40 millimeters. it has hot summers and cool winters.chris's city is in a climate, while mark's city is in a climate.