In what country would you find the mosul dam, which is built on gypsum rock and must be maintained by grouting daily?

The Mosul Dam is located in Iraq- this is the correct answer.

It was built 30 years ago and currently it is causing fears of it breaking; it's located on gympsium, which is prone to erosion.

The Mosul Dam is currently in the hands of the Iraqi government but  it was shortly occupied by ISIS to.

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor: