Answer:
a deposit of water that flows into a lake or river is a delta
Https://www.pbs.org/wgbh/pages/frontline/shows/religion/why/appeal.html
the first website is why christianity was appealing back then,
the second website is why islam religion was succesful
https://askanislamicist.wordpress.com/2014/07/14/why-was-the-islamic-expansion-successful/
Racial discrimination ...........
In Egipt with the faraon and slavery