Answer:
Aquifers: underground water sources. An aquifer is an underground bed or layer yielding ground water for wells and springs etc
Archipelago: a group of islands clustered together in a large body of water. An archipelago is a group of many islands in a large body of water.
Delta: a broad, triangular-shaped land area at the mouth of a river. A delta is a low triangular area of alluvial deposits where a river divides before entering a larger body of water.
Desertification: a change causing an area to become more arid. Desertification is a geological process whereby the gradual transformation of habitable land into desert; is usually caused by climate change or by destructive use of the land.
Diaspora: the scattering of a group of people outside of their homeland . Diaspora is defined as the dispersion or spreading of something that was originally localized (as a people or language or culture).
Drought: a long period of dry weather resulting in water shortages. Drought is defined as a prolonged shortage of rainfall resulting in water shortages.