water and its importance in our planet

hydrology aquifer rainfall evaporation condensation precipitation groundwater drought hydration filtration irrigation desalination contamination aquaculture ecosystems hydropower transpiration salinization glaciers wetlands sustainability h2o rainforest watercycle watershed drinkable flooding reservoirs estuaries hemisphere evapotranspiration oceans dehydration icecaps replenishment seepage freshwater hydrosphere coasts pollution rivers dams seas tides monsoons lakes springs wells marshes fluids