6) are a very large area of ice that moves slowly down a slope or valley or over a wide of land. * 10 points
Environment
Geography
Population
Watershed

Watershed.

Explanation:

Watershed is an area within our land that drains the melted ice and rainfall that occurred down to the streams of  river or lake. People can use the water on the watershed to fulfill their various necessities (such as drinking, transportation, medium to grow their fish ponds, etc.)

Water has the tendency to flow from the place with higher elevation to the places with lower elevation. This is the reason why watershed Typically located a little bit lower down the slope of the elevation.

answer; (b) ; /stronger bonds between the nations of africa

using the scientific method.