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

How did german physicist werner heisenberg's uncertainty principle shake beliefs in newtonian physics?

Why did the federal government choose to give each tribal member a 25-year deed to the reservation land? this was the life expectancy of native americans at this time, and the government wished to grant rights for only a single generation. they considered this to be enough time to keep the area calm before they could take the land back again for sale. the united states government believed that the nutrients from the land would be depleted by the end of the deed. the government believed this would be enough time for the tribal members to become self-reliant and adapt to the farming lifestyle.

The system of checks and balances ensures that