Answer:
This is perhaps due to Mexico City's high altitude (7382 ft above sea level), its oxygen levels are 25% lower and fuels do not combust completely. But it is important to mention that proliferation of vehicles, rapid industrial growth and the population boom are considered the main causes of this situation.
Explanation:
The first civilizations appeared in locations where the geography was favorable to intensive agriculture. Governments and states emerged as rulers gained control over larger areas and more resources, often using writing and religion to maintain social hierarchies and consolidate power over larger areas and populations.
Answer: Maybe its A the Mayan civilization was surrounded by mountains, and Harappa was not.
Explanation: hope it helps :)
In the 1920s the main thing that business and industries did that caused the economy to slow down was to overspend and refuse oversight regulation.