Glaciers advanced from Canada and retreated four or more times. Over a few million years, Puget Sound was carved and scoured by glaciers. Heavy Pressure. Glaciers containing up to 2,383 cubic miles of ice pushed over the Puget lowland.
AM stands for amplitude modulation, while FM stands for frequency modulation. In AM, the amplitude (the height or depth of the crests or troughs) changes, while in FM, the fre â¦ quency changes. Answered.
HAM VHF | HAM 52 | 146.5200 FM | HAM CALLING SIMPLEX. 146.52 MHz FM Simplex is widely known as the ham radio 2 meter Calling Frequency. It is the most widely monitored simplex frequency in USA, but it should not be depended upon for emergency 911 type calls, because there are no organized first-responders on it.