Plate __; Motion of Large Pieces of Earth's Shell

This page is the CodyCross answer for the clue below from Train Travel, Group 716, Puzzle 5 (Platform and Concourse).

Question is: Plate __; Motion of Large Pieces of Earth's Shell

and the answer is: TECTONICS

Word Meaning:

TECTONICS — (geology) The study of crustal plates and other large-scale structural features of the Earth.

Definitions from Wiktionary.

Plate __; motion of large pieces of Earth's shell — CodyCross Answer | CodyCross Solutions