How does water get below the surface to become groundwater?

Water seeps into the soil from rivers and streams.
Water from oceans overflows, seeping into the ground.
Water from precipitation soaks into cracks in soil and rock.

It is believed that europa, one of jupiter’s moons has an ocean beneath its surface. based on how earth’s oceans and atmosphere are believed to have formed, what can be said about europa’s supposed ocean? the arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced , similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s .

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

In which layer do organisms on earth love?