QuestionJuly 2, 2025

Both varieties of __ happened in the opening moments of the 1980 eruption of Mount Saint Helens. A) Merapian-style pyroclastic flows. B) Pelean-style pyroclastic flows. C) Plinian-style pyroclastic flows. D) Vesuvian-style tephra falls.

Both varieties of __ happened in the opening moments of the 1980 eruption of Mount Saint Helens. A) Merapian-style pyroclastic flows. B) Pelean-style pyroclastic flows. C) Plinian-style pyroclastic flows. D) Vesuvian-style tephra falls.
Both varieties of __ happened in the opening moments of
the 1980 eruption of Mount Saint Helens.
A) Merapian-style pyroclastic flows.
B) Pelean-style pyroclastic flows.
C) Plinian-style pyroclastic flows.
D) Vesuvian-style tephra falls.

Solution
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Answer

C) Plinian-style pyroclastic flows. D) Vesuvian-style tephra falls. Explanation 1. Identify eruption styles Merapian and Pelean styles are associated with pyroclastic flows, while Plinian and Vesuvian styles involve tephra falls. 2. Determine correct styles for Mount Saint Helens The 1980 eruption of Mount Saint Helens is known for its explosive nature, characterized by Plinian-style pyroclastic flows and Vesuvian-style tephra falls.

Explanation

1. Identify eruption styles<br /> Merapian and Pelean styles are associated with pyroclastic flows, while Plinian and Vesuvian styles involve tephra falls.<br />2. Determine correct styles for Mount Saint Helens<br /> The 1980 eruption of Mount Saint Helens is known for its explosive nature, characterized by Plinian-style pyroclastic flows and Vesuvian-style tephra falls.
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