Question

what is underground water

Answer 1

Answer...

Groundwater is the water present beneath Earth's surface in soil pore spaces and in the fractures of rock formations. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. 

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Answer 2

Groundwater is the water present beneath Earth's surface in soil pore spaces and in the fractures of rock formations. 
OR
Groundwater is the water found underground in the cracks and spaces in soil, sand and rock. It is stored in and moves slowly through geologic formations of soil, sand and rocks called aquifers.