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What is water H2O
Water is the common name for the liquid state of the hydrogen-oxygen compound H2O. Pure water is odorless and tasteless, and at greater depths has a blue tint. With standard atmospheric pressure the freezing point of water is 0° C (32° F) and and will boil at 100° C (212° F). Water will obtain its maximum density at 4° C (39° F) and when it freezes it expands








Longest River, the Nile and the Amazon can both be called the longest river in the world depending on how you define longest. With several mouths, the exact point at which the Amazon ends continues to be uncertain. Counting the Para’ estuary (the most distant mouth), the Amazon’s length is approximately 4,190 miles. Once officially recorded as having a length of 4,145 miles, the Nile has since lost a few miles due to the formation of Lake Nasser behind the Aswan High Dam