Why is china's urban system such a good example of central place theory?

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory

Suppose that the sun shrank in size but that its mass remained the same. what would happen to the orbit of the earth?

3ways , explain how advance technology affects the word population