Groundwater is the result of rainwater sinking into the ground through cracks in soil, rock, and gravel. The water falls through the ground to the aquifer, an underground section of permeable material such as sand or fractured rock, where it fills the cracks and begins to flow. The speed of the flow depends on the size of the spaces in the aquifer and how connected it is. For more on groundwater, see the link below.
To add on the above reply, I’ve attached a link to a flash animation diagram of groundwater and the process of how it is formed, extracted and its uses. I hope the visual makes things clearer, if need be.
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