Final answer:
The Mount St. Helens eruption in 1980 taught important lessons through its impact on lives and the environment, emphasizing monitoring and preparedness.
Explanation:
Mount St. Helens eruption in 1980 was a significant event that taught valuable lessons. The eruption resulted in devastation including loss of lives and destruction of property, highlighting the impact of volcanic activity on human lives and the environment. It also underscored the importance of monitoring and preparedness in mitigating volcanic hazards.
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