The correct option is C equal rainfall depth
Line joining the points of equal rainfall depth is called isohyet.
NameIsopleth of (i.e., line joiningplaces of equal)isobarPressureisobathdepth in seaisobrontthunderstorm at the same timeisochronetravel time from a common centreisohalinesalinityisohelssunshineisohyetsrainfallisonifsnowfall amountisocrymefrostisothermtemperature