yess hehe
They are formed by several factors along the time, including weathering.
oklahoma's rivers flow south-east
south
The Continental Divide (in North America) marks the direction (towards the Pacific or Atlantic and Gulf of Mexico) rivers flow.
Mexico
South
Rivers always flow downhill, regardless of compass direction. It is a myth that rivers "normally" flow from north to south.
they flow west
Rivers can flow in any compass direction, a river will always flow downhill.
Actually many rivers run north in North America. Water has no sense of direction. If flows downhill by gravity. Most rivers east of the Rocky Mountains do flow in a southerly direction because the elevation is lower to the south and they are flowing toward the Gulf of Mexico. Source: Riverlorian.com
All rivers flow down slope and usually towards the Sea.
Gravity :)