It's an area that is organized around a focal/nodal point where there is a central focus. The central diminishes as you move outwards from the point. Generally used to display information about economic activities.
I'm pretty sure its C. sonar.
Answer:
Transport of sediments causes them to become rounder as their irregular edges are removed both by abrasion and corrosion. Beach sand becomes highly rounded due to its endless rolling and bouncing in the surf.
Answer: Which examples represent abiotic factors affecting biotic factors are: B. Ash from a volcanic eruption kills new plant growth. D. Warm water from a nuclear power plant causes overgrowth of algae. E. a river floods and deposits tree pollen along its banks.
