What are the two principal source of fresh water on this planet
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About two-thirds of the Earth's surface is covered with water. Of this, around 97.5% by volume is held in the oceans as salt water; only 2.5% is fresh water and only a very small fraction of this is accessible as a water source. Surface water, groundwater and rainwater are our main sources of water.
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groundwater aquifers and surface water resources
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