Match the heat transfer mechanisms to the correct description of how heat is transported in or from the earth. radiation
a) warm, low-density materials rise and cool, high-density materials sink
b) heat is transported away from earth and into outer space
c) heat flows between two materials in contact with each other

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:

None   they are   equally likely to occur on any plate boundary