Boundaries based on the median-line principle are generally associated with a. major highways
b. converging ethnic territories
c. unsettled frontier zones
d. bodies of water
e. mountain ridges

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons