" The Beginnings Of Society"
What were the four reasons that the earliest civilizations were all located in river valleys?
3 Answers
Here are some very interesting notes on what civilization is, where it usually prouted and why, and why people moved to more dangerous and less fertile areas like the mountains. Crash Course World History: Rethinking Civilization by John Green The video's on this channel explain things like world & US history & psychology in a very fun & accessable, yet academically sourced way, in which a lot of useful general cause-effect relationships are explained and camparations to pop culture used,which is why I think they are great for getting a feel of many diverse and interesting topics. I advise you to watch some of them. 
I'm happy to assist you this one time, but this type of question has very little to do with language skills, so it doesn't really belong on this website. Asking questions is good (IF you do so because you don't understand, not because you're lazy), but try to ask them to the right people, and show that you've tried (it makes people more eager to assist you). I'm sure you could've come up with at least 1 answer by yourself. Also, because you specifically asked for 4 reasons, I'm assuming this is a homework assignment. If this is the case, I urge you to try to think for yourself, look through your textbook and/or do a bit of research on the internet. If you're not sure how, ask your teacher, I'm certain (s)he'd love to teach you. In the (not even all that) long run, you'll gain many very useful skills and become much less dependant of others. They'll make you study anyways, why not actually learn some things that'll help you a lot later while you're on it? You'll have more knowledge, know-how, appear smarter and be more succesful in pretty much everything, including career and thus gaining money so you can buy all that awesome stuff. It's hard work, but it really, really pays off and you'll thank past you, guaranteed.
I'd say acces to fresh water for drinking, washing, fishing, (getting rid of destructive fires) and irrigation must've played a role, as well as (a bit later) acces to the ocean and thus the economical advantage of commerce, without being directly on the shores, where the ground is salty and unsuited for agriculture and where attacks from foreign ships (the seaworthy ones tend not to fit in the rivers. Apart from drinking water, the most important reason would be that river valleys are fertile, so there's plenty to gather and hunt. This is all logic and knowledge I acquired in the way described above.
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