Tectonic Plates Are Doing This Over Time

This page is the CodyCross answer for the clue below from Campsite Adventures, Group 824, Puzzle 4 (Scavenger Hunt).

Question is: Tectonic Plates Are Doing This Over Time

and the answer is: SHIFTING

Word Meaning:

SHIFTING — A shift or change; a shifting movement.

Definitions from Wiktionary.