What type of water is commonly found in aquifers?

Aquifers are geological formations that can store and transmit water, primarily composed of groundwater. Groundwater is water that fills the spaces between soil particles and fractures in rock layers beneath the earth's surface. It plays a crucial role in the hydrological cycle, providing an important source of drinking water for communities and irrigation for agriculture.

In contrast, brackish water is a mixture of fresh and saltwater, typically found in coastal areas where freshwater from rivers meets seawater. Surface water refers to water found in bodies like rivers, lakes, and reservoirs, which is distinct from the water stored underground in aquifers. Atmospheric water, on the other hand, consists of water vapor present in the air, and does not have the same characteristics as water stored underground.

Understanding that aquifers contain groundwater emphasizes the importance of this water source for sustaining ecosystems and meeting human needs. This underscores why groundwater is the correct answer in relation to what type of water is commonly found in aquifers.