How is India able to sustain civilizations based on its climate, geography and resources?

This would anwser some of your questions

Explanation:

Both the Indus and the Ganges rivers carried rich silt from the mountains to the plains. When the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.

answer; ethnocentric;

answer; adjusting and adapting to a culture other than one's own;