The term that describes an underground layer of porous and permeable rock that holds water is aquifer.
The correct answer is "aquifer." An aquifer is an underground layer of porous and permeable rock that can hold and transmit water. To determine the correct answer, you can think about the characteristics of each option and consider their definitions. Subsidence refers to the sinking or settling of the ground, which is not directly related to holding water. A reservoir is a man-made storage area for water, usually created by constructing a dam. A deposit typically refers to a layer of rock or sediment that has been left behind by a natural process, but it doesn't necessarily imply the ability to hold water. Therefore, out of the given options, "aquifer" is the most accurate term that describes an underground layer of porous and permeable rock that holds water.
