Only 3 short questions
how was iwo jima battle different from the other pacific battles, geographically speaking?
why was the island difficult to overtake?

what was the end result? (who won)

The geographical difference between Pacific and Iwo Jima wars is that the pacific war was fought in the pacific and Asia. The brilliant strategy used by the Japanese made the island difficult to undertake. It was the US that finally won the war.

Explanation:

Pacific wars were fought between Japanese and US forces during the Second World War. The forces of Canada, UK, New Zealand etc also contributed their forces in this war. The geographic location of Pacific war is Pacific and parts of Asia.  

Iwo Jima battles were fought between Japanese and US forces at the volcanic island of Iwo Jima. Thus the geographic locations of pacific and Iwo Jima wars are different. The island was difficult to undertake because of the fight strategy chosen by the Japanese forces.

Even though there were several casualties it was the US forces that finally won the Iwo Jima war.  

soviet influence spread across eastern europe sharply during and after wwii. the soviet armies liberated the countries in eastern europe and occupied them from the germans as they were forced to retreat towards germany.