Which of the following best explains how a tephra deposit forms?
A. Airborne ash and rocks from a volcanic eruption remain suspended in the air for a long time before eventually settling to the ground in a new location far from the volcano.
B. Highly fluid lava erupts from an active volcano and flows across great distances, slowly solidifying into a flat surface.
C. As magma is forced upward, it travels through vertical cracks in the crust, spreading outward and pushing up an overlying layer, creating a dome.
D. As magma is forced upward, it travels horizontally through cracks in the crust,

Question

06-12-2022
Geography

Answered

Which of the following best explains how a tephra deposit forms?
A. Airborne ash and rocks from a volcanic eruption remain suspended in the air for a long time before eventually settling to the ground in a new location far from the volcano.
B. Highly fluid lava erupts from an active volcano and flows across great distances, slowly solidifying into a flat surface.
C. As magma is forced upward, it travels through vertical cracks in the crust, spreading outward and pushing up an overlying layer, creating a dome.
D. As magma is forced upward, it travels horizontally through cracks in the crust,

Answer :

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tutorconsortium633 tutorconsortium633 · Answer 1 · 2022-12-08T14:20:02-05:00

Correct option is (a) Airborne ash and rocks from a volcanic eruption remain suspended in the air for a long time before eventually settling to the ground in a new location far from the volcano.

What is a tephra deposit?

Magma and rock are destroyed and broken apart by the sudden explosion of expanding gases. The degree of fragmentation increases as explosivity increases.

A general name for any airborne pyroclastic buildup is tephra (Greek for ash). Tephra has not yet solidified.Specific forms of tephra can be further classified by physical characteristics within this size range.

For instance, basaltic lava pieces the size of lapilli may fast cool while in flight, forming the glassy Pele's tears lapilli. These molten particles may be pulled out into tiny strands known as Pele's hair during high winds.

Nonexplosive Hawaiian-type eruptions frequently produce lapilli- to bomb-size fragments, known as spatter, that are still liquid when they hit the ground surface because they only spend a brief time in the air.

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