What is the world's major water source?

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The oceans are the world's major water source, containing approximately 97% of Earth's total water supply. This vast amount of saline water plays a crucial role in the global climate system, ocean currents, and the hydrological cycle. While streams, rivers, and groundwater are important freshwater resources, their volumes are significantly smaller compared to the immense quantity of water held in the oceans. The atmosphere also contains water in the form of vapor, but again, its contribution to the total water supply is minimal. Therefore, when considering the overall volume of water available on the planet, oceans are unquestionably the dominant source.