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Geophysics is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment.
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Why is the pond in my backyard not frozen when it is -15 °C (5 °F) outside?
Whether and how long it takes a pond or other body of water to freeze depends on several factors. Air Pressure, TDS (total dissolved solids, or salts), motion of the water itself and the temperature …