Why did the British issue the Balfour Declaration?

to finally resolve the Israeli-Palestinian conflict
to show support for a Jewish nation in Palestine
to assist Palestinian refugees in their return to Israel
to turn over the supervision of Palestine to the United Nations

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:

Earthquake waves that vibrate from side to side and up and down only through solids are known as "seismic waves."hope my answer has you : )