The idea that regions are fluid means that __________.
Aearth���s surface is floating on a hot magma layer
Ba region cannot support life without a source of freshwater
Ca region is difficult to define because it is influenced by people's perceptions and perspectives
Dformal geographic and political boundaries define a region
Aearth���s surface is floating on a hot magma layer
Ba region cannot support life without a source of freshwater
Ca region is difficult to define because it is influenced by people's perceptions and perspectives
Dformal geographic and political boundaries define a region