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Author Question: Compare and contrast explosive and effusive eruptions. Include their locations, the chemical ... (Read 92 times)

NguyenJ

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on: Jul 14, 2018
Compare and contrast explosive and effusive eruptions. Include their locations, the chemical composition of the magma, and the landforms they typically produce.
 
  What will be an ideal response?

Question 2

Discuss the process and causes of folding, and distinguish between anticline and syncline.
 
  What will be an ideal response?


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cam1229

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Reply #1 on: Jul 14, 2018
Answer to Question 1

Effusive eruptions are outpourings of low-viscosity magma that produces enormous volumes of lava. The basaltic rock is low in silica (less than 50) and rich in iron and magnesium. Effusive eruptions pour out on the surface with relatively small explosions and few pyroclastics. Effusive eruptions may come from a single vent or from a flank of a volcano through a side vent or even fissures.
Explosive eruptions are violent explosions of magma, gas, and pyroclastics driven by pressure build-up in a magma conduit. The magma is thicker and more viscous than effusive magma.

Answer to Question 2

When rock strata that are layered horizontally are subjected to compressional forces, they become deformed. Folding occurs when rocks are deformed as a result of compressional stress and shortening. An arch-shaped upward fols is an anticline. A trough-shaped downward fold is a syncline.


NguyenJ

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Reply #2 on: Jul 14, 2018
Thank you :)


cam1229

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Reply #3 on: Jul 14, 2018
Happy to help you


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