A Second Class stamp
order cyclophosphamide Now, as then, three crucial natural factors coincided – an especially deep depression, very strong winds and an extremely high tide. The low pressure of the depression caused air to rise, taking some of its weight off the sea and causing its waters to bulge upwards. The winds drove the bulge towards land and down through the North Sea, causing it to rise even more as it funnelled into the seas increasingly narrow southern part. And the spring tides did the rest.