An subterranean layer of water-bearing porous rock, rock fractures, or unconsolidated materials is known as an aquifer (gravel, sand, or silt).
A water well can be used to extract groundwater.
The Ogallala Aquifer, often called the High Plains Aquifer, is one of the world’s greatest underground freshwater sources.
It covers an area of the Central Plains that is believed to be 174,000 square miles and holds as much water as Lake Huron.
Final Answer:
Hence Aquifer is the Earth’s water-bearing layer.