What three geographic of oceania and what is the biggest problem the face

Oceania is a region made up of thousands of islands throughout the Central and South Pacific Ocean. It includes Australia, the smallest continent in terms of total land area. ... Oceania also includes three island regions: Melanesia, Micronesia, and Polynesia (including the U.S. state of Hawaii). In fact, many scientists argue that Australia and Oceania is the continent most vulnerable to climate change because of its climate and geography. The heavily coastal populations of the continent's small islands are vulnerable to flooding and erosion because of sea level rise.

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