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Answer for the clue "Siege once broken, involving cold study of rock structures? ", 10 letters:
geoscience

Word definitions for geoscience in dictionaries

Wiktionary Word definitions in Wiktionary
n. Any of several sciences that deal with the Earth

Usage examples of geoscience.

Efforts, however, are underway to establish a viable predictive model which will integrate the various tectonic, geologic, hydrological, and seismic dynamics presently under investigation by Geosciences Department personnel.

His gaze went to Joe, who was now climbing the steps of the geoscience building.

Imperial Sassan Academy of Geology, Planetology, and Geosciences CHAPTER 25 Sinklar walked into his palace bedroom and found Anatolia propped on the sleeping platform, preoccupation in her haggard eyes.

I bet the line at the Directorate of Geosciences already stretches clear around the block.

Her background was in geosciences engineering, specializing in the polar regions.