What is the contour interval in the image below?

Answer erosion,oil spills,pollution,tourism,urban development;

Ithink i might know wait one second let me serve

Largely uneconomic because they provide little profit or food surplusi think so

The highest point of a hill (or mountain) is a single point.
a single point can only be precisely marked with a dot. 
putting on a contour line is impossible  on a single point because the contour line is created after multiple points that have the same hight are marked, and after that, all of those points are connected with a line that creates a closed area. so the highest point, as said above, is a single point, there are no other points with the same height, so the only possible way for it to be marked is with a dot, and there is no possibility for a contour line.