Question

Question was provided via image upload.

Explanation:

The principle being referred to is the "Principle of Cross - Cutting Relationships" in geology (a subfield of Natural Science). This principle states that a fault or igneous intrusion is younger than the rock it affects. The text in the image, after deciphering the hand - written (or over - written) part, should be filled with "cross - cutting relationships" as it fits the context of geological principles related to the relative age of rocks and geological features.

Answer:

cross - cutting relationships