1. aborigine [] a group or chain of islands
2. archipelago [] the transformation of land from green to desert
3. atoll [] the removal of trees over a widespread area of land
4. deforestation [] to remove the salt from something, e. g., the ocean
5. desalination [] an island formed from coral
6. desertification []people native to the australian continent

Aborigine- These are the native people living in the mainland of Australia as well as many of its nearby islands. They have been dwelling in those places since a long time.

Archipelago- It usually refers to a chain or a group of islands. For example, the islands near Hawaii.

Atoll- These are coral reefs that are circular in shape and surrounds a water body that is commonly known as lagoon. These are a type of islands that are constructed from corals.

Deforestation- The deforestation is a process of cutting down of trees or the removal of trees over a large geographical land area.

Desalination- It is a process of eliminating salts from a particular solution. It is commonly carried out in the countries of middle east.

Desertification- It refers to the transformation of land area containing green vegetation into desert areas.