Mount Rainier Volcano is a Ticking Time Bomb- Documentary 2015
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Mount Rainier is a stratovolcano and began erupting one half to one million years ago. Its most recent activity was in the 1890s. Each eruption alternates from quiet lava eruptions to large debris forming eruptions. Lava and loose rubble built up to form layers and a tall cone, whose upper section was destroyed highly likely due to explosions, landslides, or the glaciers that formed the mountain's rugged structure. The peak's summit has also worn down over the years, but the eruptions in the last 2,000 years have rebuilt the landform to its current height of 14,410 feet today.