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.
Report Abuse. AM runs from 535 kHz to 1,605 kHz and is in the MF (Medium Frequency) range. MF is from 300 kHz to 3,000 kHz. FM runs from 88 MHz to 108 MHz and is in the VHF (Very High Frequency) range.VHF is from 30 MHz to 300 MHz. The 2 links below gives additional details. The answer about AM and FM being modulation types isn't all that accurate.F is from 300 kHz to 3,000 kHz. FM runs from 88 MHz to 108 MHz and is in the VHF (Very High Frequency) range. VHF is from 30 MHz to 300 MHz. The 2 links below gives additional details.