Is most of our groundwater stored in earth's streams rivers and lakes?

No, most of Earth's groundwater is not stored in streams, rivers, and lakes. Instead, the majority of groundwater is found in aquifers, which are underground layers of permeable rock and sediment that can hold water. While surface water bodies like streams, rivers, and lakes contain significant amounts of water, they represent only a small fraction compared to the vast reserves of groundwater located beneath the Earth's surface.