Resources

Water covers 71% of the Earth's surface, but only 2.5% is freshwater.
Main sources of freshwater: surface water (rivers, lakes), groundwater, and glaciers/ice caps.
Renewable vs. non-renewable water resources.
Challenges in water supply: uneven distribution, pollution, overexploitation, and climate change impacts.
Strategies to manage water resources: conservation, recycling, desalination, and sustainable agriculture practices.

Exam Tip: Understand the global distribution of water resources and be able to evaluate sustainable management strategies.

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