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Which of the Following Would Be Considered an External Shock

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Which of the following would be considered an external shock?


Definitions:

Lava Fountain

A jet of molten lava that is ejected into the air from a volcanic vent.

Pyroclastic Column

A dense cloud of hot ash, gas, and volcanic matter that rises above a volcano during an explosive eruption.

Lava Dome

A dome-shaped mountain or hill of at least partly solidified lava generally of felsic to intermediate composition.

Lava Flow

Magma that erupts onto the surface and flows downhill from the vent; also the solidified body of rock formed by this magma.

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