QUESTION 5 Chapter 3.2. What is effusive volcanism? O a When large amounts of as

Question

QUESTION 5 Chapter 3.2. What is effusive volcanism? O a When large amounts of ash are erupted out of a volcanic vent O b. When lava comes out of a vent or fissure and then spreads out over the landscape O c. when ejected volcanic rocks stream down the sides of volcanoes powered by hot expanding gas O d. When a volcano erupts hot gases that diffuse into the atmosphere QUESTION 6 Chapter 3.2. Table 3.2. What does the Volcanic Explosivity Index (VEI) tell you about a volcanic eruption? a. A description of how explosive it was O b. The volume of pyroclastic materials that were erupted cThe height of the cloud column erupted O d- All of the above QUESTION 7 Chapter 3.2.1. What is the difference between magma and lavai? OaNone, the two terms can be used interchangeably. O b. Magma is melted rock beneath the surface, while lava is melted rock on the surface. c. Magma is basaltic whereas lava is peridotite. O d. Magma is what is produced at mid-ocean ridges, while lava is what is produced at subduction zones.

Explanation / Answer

QUESTION 6

What is effusive volcanism?

ANSWER:

b. when lava comes out from the fissure or ven and spread out over the landscape

EXPLANATION:

In this type of volcanism the lava steadily flow out of a volcano onto the ground.

QUESTION7

What does the volcanic explosivity index (VEI) tell you about the volcanic eruption?

ANSWER:

d. All of the above

EXPLANATION:

The volcanic explosivity index gives us a way to measure the relative explosiveness of volcanic eruptions. it measures how much volcanic materials is ejected, the height of material thrown into the atmosphere and how long the eruptions last.

therefore all the given option are correct. hence right option is D.

QUESTION 8

What is the difference between magma and lava ?

ANSWER:

b. Magma is melted rock beneath the surface, while lava is melted rock on the surface.

Explanation:

Actually, when magma comes into the surface of the earth, the gas which was dissolved in the magma escape into the air and the rest of the material is called Lava.

therefore   

LAVA + GAS = MAGMA

Hence the option B is the correct answer. that is   Magma is melted rock beneath the surface, while lava is melted rock on the surface

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