Lava that cools quickly forms rocks. a. extrusive metamorphic c. intrusive metamorphic b. extrusive igneous d. intrusive igneous

The correct answer is b. extrusive igneous.

Extrusive igneous rocks refers to rocks that form when volcanic lava (which is molten) quickly cools and becomes solid. Extrusive igneous rocks have tiny crystals since there is little time for larger crystals to form when lava cools and solidifies quickly. 

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:

Migration people get up and go cause they feel it is best for them