I thought you were asking what comes after 23 );
There are three mountains: the Sierra Madre Occidental, the Sierra Madre Oriental, and Sierra Madre del Sur.
The common geographic factor for Egypt and the fertile crescent were the big rivers, they made big alluvial deposits on their shores each year and allowed the people to have sufficient amount of food production. That opened the gates for civilizations to flourish in this places.
1the present of raw material
2the need for markets.
3) the search for labour force.
