which of these water sources is considered part of the groundwater system?\naquifer\nocean\nriver

which of these water sources is considered part of the groundwater system?\naquifer\nocean\nriver
Answer
Brief Explanations:
An aquifer is an underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand, or silt). Oceans are surface - water bodies and rivers are also surface - water bodies flowing on the land. Groundwater is the water that is found underground in the pore spaces and fractures in rocks and soil. Aquifers are the main storage units of groundwater.
Answer:
aquifer