What are the names of the three regions that comprise oceania

Oceania are the islands throughout the Pacific Ocean.
The three regions that comprise Oceania are: Micronesia, Melanesia and Polynesia. All these are island regions.
Micronesia is a group of small islands in the western Pacific Ocean.
Melanesia is the group of islands from New Guinea island in the southwestern Pacific Ocean to the Arafura Sea.
Polynesia is a group of islands scattered over the central and southern Pacific Ocean.

Asmall closed hole formed in an outwash plain or moraine. forms when a  glacier retreats then remains stationary. 

Answer sinking and cooled;