Final answer:
Variations in climate, rock and sediment types, and topography contribute to the non-uniform distribution of groundwater on or below the Earth's surface.
Step-by-step explanation:
Variations in climate, rock and sediment types, and topography contribute to the non-uniform distribution of groundwater on or below the Earth's surface. Groundwater is stored in the pores between particles in sand, gravel, and in the fissures in rocks. Different climates, types of rocks and sediments, and the varying topography of an area can affect the amount and availability of groundwater in different regions. For example, areas with high precipitation and permeable rocks may have more groundwater, while areas with low rainfall and impermeable rocks may have less groundwater.