Which element of a volcanic eruption could have the most far-reaching impact on humans, up to hundreds of miles away? A. Pyroclastic flow
B. Shock wave
C. Magma
D. Lava
Which element of a volcanic eruption could have the most far-reaching impact on humans, up to hundreds of miles away?
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The correct answer is A. Pyroclastic flow.
Pyroclastic flows are fast-moving currents of hot gas and volcanic matter (tephra) that flow down the sides of a volcano during an explosive eruption. They can travel at high speeds and can reach temperatures of about 1000 degrees Celsius (1832 degrees Fahrenheit). Because of their speed and temperature, pyroclastic flows can cause widespread destruction and have devastating effects on human settlements and the environment, potentially impacting areas hundreds of miles away from the eruption site.