Final answer:
The majority of Earth's easily accessible freshwater is found in underground aquifers.
Step-by-step explanation:
The majority of Earth's easily accessible freshwater is found in underground aquifers. Groundwater is water located in small spaces, called pore space, between mineral grains and fractures in subsurface earth materials (rock or sediment). Most groundwater originates from rain or snowmelt, which infiltrates the ground and moves downward until it reaches the saturated zone where groundwater completely fills pore spaces in earth materials.