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.
The received signal becomes an electrical waveform again when the receiving antenna performs the opposite conversion. At both ends of the link, the signal may at some point reside in the discrete-time domain. AM radio broadcasting has assigned channels, ranging from 540 kHz to 1,700 kHz and spaced at 10-kHz intervals. If your desired station is at 750 kHz, adjacent channels lie 10 kHz above and below at 760 and 740 kHz.