B- are spaced closely together.
You can google ”steep slope map” and you will find some explanations if you need
Clot
clots
land
lands
lots
slot
loan
loans
slant
sand
coal
coals
C I’m positive and it’s logical
The isoline representation is the most used method to visualise quantitative phenomena which occur comprehensively and which values vary continuously in space. They are therefore called continua. Examples for such continua are temperature, air pressure, precipitation heights or ground elevations.