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Water fundamentals

Water covers 70 per cent of the earth’s surface – the volume of water on earth has remained unchanged for millions of years. However, 97 per cent of the earth’s water is salt water, and less than 1 per cent is fresh water in liquid form.

Key terms and definitions

Many definitions, terminology and units have come into use in the field of water management over time. ExxonMobil uses the following definitions.