Science Source Feb 2010
EN_90286397_0240
![Science Source Feb 2010](img/medium/arch1/dvd0114/15/EN_90286397_0240.jpg)
Mount St. Helens erupted often between 1980 and 1986. An explosive eruption on March 19, 1982, sent pumice and ash 9 miles (14 kilometers) into the air, and resulted in a lahar (the dark deposit on the snow) flowing from the crater into the North Fork Toutle River valley. Part of the lahar entered Spirit Lake (lower left corner) but most of the flow went west down the Toutle River, eventually reaching the Cowlitz River, 50 miles (80 kilometers) downstream.
2010-02-13
EAST NEWS
Science Source
Science Source/USGS
bk3966
1,39MB
25cm x 16cm by 300dpi
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