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

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

User Antalkerekes
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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.
User Kamil Kulig
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