Question

Very light, thin lines that separate the colored areas or rock units on a geologic map are called _____.

Answer 1

Very light, thin lines that separate the colored areas or rock units on a geological map are called contact lines.

Answer 2

Very light, thin lines that separate the colored areas or rock units on a geologic map are called contact lines. The place where two different geologic units are found next to each other is called a contact, and that is represented by different kinds of lines.