I’m just answering for the points lol but your question doesn’t make sense
Answer:
These areas had the most resources.
Explanation:
When you are settled by rivers, you have the sources you need to grow crops, raise life such as cows, pig, chicken. Not only this but you also have a place to bath, collect drinking water, and wash clothing. Life thrives more on river sides rather than inland during these times as they did not have all the tech we do today.
Answer:
a) Gross Domestic Product
dont confuse yourself with national income okay?
go for it!!
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Currently our continents are move about 1-2 inches towards each other every year. over the course of many years we could end up colliding with other contries which would cause new mountain ranges and another supercontinent.