What is groundwater?

What is groundwater?

• A. Water in rivers and lakes only.
• B. The vaporization of water from soil into the atmosphere.
• C. Water beneath the surface found between rock and soil of varying permeability; it flows toward larger bodies.
• D. Water stored in ice caps.

Answer: (C)

Groundwater is water that sits underground in the pores and cracks of soil and rock. It forms when rain or surface water infiltrates down through the soil and moves slowly through permeable layers until those spaces are filled with water, creating an underground store that can flow toward larger bodies of water like rivers and oceans. The statement described captures this idea: water found beneath the surface between rock and soil, in materials with varying permeability, that can move under the influence of pressure and gravity toward bigger water bodies. The other ideas describe different parts of the water cycle: water in rivers and lakes is surface water, not groundwater; vaporization from soil into the atmosphere is evaporation (a surface process rather than groundwater); and water in ice caps is part of the cryosphere, not groundwater.

Groundwater is water that sits underground in the pores and cracks of soil and rock. It forms when rain or surface water infiltrates down through the soil and moves slowly through permeable layers until those spaces are filled with water, creating an underground store that can flow toward larger bodies of water like rivers and oceans. The statement described captures this idea: water found beneath the surface between rock and soil, in materials with varying permeability, that can move under the influence of pressure and gravity toward bigger water bodies.

The other ideas describe different parts of the water cycle: water in rivers and lakes is surface water, not groundwater; vaporization from soil into the atmosphere is evaporation (a surface process rather than groundwater); and water in ice caps is part of the cryosphere, not groundwater.