Mount St. Helens is a in the state of . In 1980, a sudden changed the and the land around it. A dark cloud of rose into the sky, and hot rocks and bits of blasted outward. A wide formed at the top, and nearby areas were knocked down. Mudflows rushed down the valley toward the , even after people heard a .
Before the event, rising caused many signals inside the mountain. Rangers told people to because scientists saw danger. A huge on the volcano’s north side suddenly let a explode outward, sending ash in a tall and throwing for miles. The area became a serious zone, and it took years for to begin.
Mount St. Helens is a studied by who use careful to track changes. Fast, hot flows raced down valleys, while muddy followed river channels. Layers of and the of ash reshaped the local . Over time, projects and nature’s own helped life return to the mountain.
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