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An ice core is a core sample from the accumulation of snow and ice over many years that have re-crystallized and have trapped air bubbles from previous time periods. The composition of these ice cores, especially the presence of hydrogen and oxygen isotopes, provides a picture of the climate at the time.
Why does snow squeak when it is really cold? It squeaks when you walk and it squeaks when you drive on it. Not powdered, fluffy snow - the compressed stuff on the side walks and streets. Is it complaining?
If you are a careful observer, you will have noticed that whether snow squeaks when you walk on it depends on how cold it is outside. When you walk on snow, your boots apply a pressure. If the temperature of the snow is warmer than approximately 14F (-10C), then the pressure exerted by your boot partially melts the snow allowing it to 'flow' under your boot and no sound is made. When the snow is colder than -10C, the pressure from your boot does not melt the snow, and instead the ice crystals beneath your boot are crushed making a squeaking, or creaking, sound.