Which of the following is a general theory in geography that can be used to quantify and predict the interaction between two cities based on population sizes, distance between the places, the number of migrants moving from one place to the other, or the flow of trade goods between the two locations? World system theory

Multiple nuclei model

Central place theory

Gravity model

Concentric zone model

E. Gravity Model

Explanation:

Just took the quiz. The gravity model can be used to mathematically predict the quantity of interactions between cities.

Gravity model

Explanation:

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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