Isotherm (contour line) – a type of equal temperature at a given date or time on a geographic map

Isobars are atoms of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number but have the same mass number. An example of a series of isobars would be ⁴⁰S, ⁴⁰Cl, ⁴⁰Ar, ⁴⁰K, and ⁴⁰Ca

Isochore and isopach maps are two different types of thickness map. To make it clear from the beginning: An isopach is a line that connects points of equal true thickness (i.e. measured perpendicular to bedding), whereas... an isochore is a line that connects points of equal vertical thickness