A pressure ridge is formed where an ice sheet is broken and one piece rides over the other. The actual "pressure" is often provided by winds, storms or ocean currents that can be many miles distant acting on the edge of the ice sheet. So at the position of the pressure ridge itself, it can be eerily calm while huge forces are exerted through the ice itself. Such pressures are what threatened and destroyed some of the ships of the early polar explorers such as Shackleton's Endurance.
I saw the most amazing pressure ridge on a walk from McMurdo Station to Scott Base (operated by the kiwis). More on Scott Base......
pues necesitaba solo valles de presion pero esta bueno
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