Final answer:
Seawater is the largest source of water on Earth, accounting for approximately 97.5% of all the water.
Step-by-step explanation:
The largest source of water on Earth is seawater.
Seawater makes up approximately 97.5% of all the water on Earth. It is found in oceans, seas, and smaller bodies such as saltwater lakes and lagoons.
Freshwater, frozen water, and groundwater also exist, but they make up a smaller percentage of the Earth's total water supply compared to seawater.
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