Migration and interdependence are aspects of which of the six essential elements of geography? .

Migration and interdependence are aspects of human systems.

Human Systems 
- The characteristics, distribution, and migration of human populations on earth's surface 
- The characteristics, distribution, and complexity of earth's cultural mosaics 
- The patterns and networks of economic interdependence on earth's surface 
- The processes, patterns, and functions of human settlement 
- How the forces of cooperation and conflict among people influence the division and control of earth's surface 

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heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.