1. For each of the following volcanic landforms, identify the principle volcanic

Question

1. For each of the following volcanic landforms, identify the principle volcanic setting (divergent boundary, convergent boundary, or hot spot) it is associated with

a. Kilauea   

b. Mt. St. Helens   

c. Eyjafjallajökull   

d. Yellowstone   

e. Fujiyama (Mt. Fuji)   

f. Mt. Mazama (Crater Lake)   

g. Deccan Plateau   

h. East Pacific Rise

2. Why does this basaltic lava have a glassy appearance?

a. The basalt is still molten.

b. All the minerals in basalt have a glassy luster.

c. The outer surface of the lava cooled very slowly.

d. The outer surface of the lava cooled very quickly.

e. All basaltic lavas have a glassy appearance.

3. Arrange these lavas in order of their original viscosity. (Highest Viscosity, High Viscosity, Low Viscosity, Lowest Viscosity.)

5. What kind of phenomenon is seen here?

obsidian flow

6. What type of lava is seen here?

7.

This outcrop shows the result of lava that solidified _____.

as part of a sill

8.

Which of the following volcanic phenomena is generally LEAST hazardous to human life?

volcanic ash

9. In a video game, players compete to create the most violent volcanic eruption. Each player must set the values for different variables, as shown in the table. Which player will win?

Florence

10.

Newberry Volcano is famous for a flow of obsidian. The source of this flow was _____ in composition.

ultramafic

12.

Which of the following minerals is LEAST likely to occur as phenocrysts in a rhyolitic lava?

Explanation / Answer

1. a: Hotspot; b: convergent; c: divergent; d:hotspot; e: convergent; f: convergent; g: hotspot; h: divergent.

2. Rapid cooling forbids any crystal formation, hence, the amorphous 'glassy' look. The answer is 'd'.

5. Pyroclastic flow - "is a fast-moving current of hot gas and volcanic matter".

6. It is basalitc pahoehoe (ropy) lava.

7. It is a 'pillow lava' structure, formed by 'under-water' cooling.

8. Lava flow, because of its low viscosity and absent of volatiles.

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