HURRY PL. which is one way surface water may become groundwater

Water evaporates from the ocean and land surfaces, is held temporarily as vapour in the atmosphere, and falls back to Earth's surface as precipitation. ... Water that infiltrates Earth's surface becomes groundwater, slowly seeping downward into extensive layers of porous soil and rock called aquifers.

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt