Mount Rainier poses a hazard to its surrounding, highly populated areas, especially the Seattle-Tacoma metropolitan area. The volcano has an extensive cover of snow and ice, which, if melted rapidly, could produce catastrophic floods and mudflows.
After Mount St. Helen's, Mount Rainier is the next most seismically active volcano in the northern Cascade Range although it has had no significant historic eruptions, minor ones did occur in the mid 1800s, and dozens of lahars are known to have occurred in the last 5,000 years.
Picture taken from an airplane on my way to Nevada. Best view in high resolution.
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