How does the great-impact hypothesis explain the differences in density between the Earth and the moon?
The moon was formed from lighter elements contained within the solar nebula.
The moon was created from core material ejected in a natural nuclear explosion.
The moon came from elsewhere in the solar system.
The moon was created from Earth's mantle and crust.

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:

The answer is 1-plate movement along fault lines

The correct answer is:   [b]:   "has no atmosphere" .