A) In what ways can Earth be considered “an island”? (HINT: Make notes on describing the earths composition in relation to the amount of water present on earth)

b) Describe the various spheres that exist on this earth. (HINT: Pay particular attention to the earth’s distribution of gases in the earth’s atmosphere. Which gas is the most abundant? Which one is the next most abundant?)

A) the biggest percentage of earths surface is water. Around 70 percent is water.

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:

980 is the correct answer