Q: An aquifer is an underground layer of rock that is saturated with what?


Read this paragraph and choose the correct option from the provided answers:

An aquifer is an underground layer of rock that is saturated with groundwater. One of the biggest aquifers in the world is the Ogallala aquifer in the American Midwest.

 Choices:

- ocean water

- wastewater

- oil

- groundwater


A:
groundwater