Which is an aspect of the kinetic-molecular theory and can be used to explain the compressibility of plasmas?

Particles move independently of one another and are widely spaced.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: