the length of the river the slope of the land the type of rock over which the water flows the location of the North Pole
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The direction water flows in a river depends on
Possibilities:
- the length of the river
- the slope of the land
- the type of rock over which the water flows
- the location of the North Pole

the slope of the land