What is the name of the water bearing layer of earth? 

Aquifer

The correct answer is option 3. Aquifer.

Aquifers are layers of unconsolidated materials, porous rock, or rock cracks that contain water (gravel, sand, or silt). A water well can be used to extract groundwater. One of the greatest subsurface freshwater resources in the world is the Ogallala, sometimes referred to as the High Plains Aquifer.