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15 Questions

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Understanding Lava Flow

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Questions and Answers

What is the temperature of lava on average?

1000 degrees Fahrenheit

2000 degrees Fahrenheit (correct)

2500 degrees Fahrenheit

1500 degrees Fahrenheit

What is the main cause of the explosive nature of lava?

Presence of fluorine gases

Dissolved rocks

Gases present in the magma (correct)

High iron content

Why does lava take several days to years to cool down completely?

High extrusion rate

Low viscosity

The presence of dissolved gas (correct)

The temperature of the flow

What forms when lava cools down after flowing from a volcano?

Rock Signup and view all the answers

What are the two major components that make up lava composition?

Oxygen and Silicon Signup and view all the answers

Which of the following statements about mafic lava is true?

It has a low silica content and low viscosity. Signup and view all the answers

What is the primary factor that determines the morphology (form and texture) of a lava flow?

All of the above Signup and view all the answers

Which of the following is NOT a characteristic of felsic lava?

It erupts at high temperatures. Signup and view all the answers

What is the primary difference between pahoehoe and aa lava flows?

Pahoehoe flows have a smooth surface, while aa flows have a rough surface. Signup and view all the answers

Which type of lava flow is associated with low-effusion eruptions?

Pahoehoe lava flow Signup and view all the answers

What is the defining characteristic of pahoehoe lava flows?

They have multiple thin flowing units and low viscosity. Signup and view all the answers

What is the origin of the term 'aa' used to describe a type of lava flow?

It is derived from the sound a person makes when walking on the rough surface. Signup and view all the answers

Which characteristic distinguishes aa lava flows from pahoehoe lava flows?

All of the above. Signup and view all the answers

What is the defining characteristic of blocky lava flows?

They have the roughest surface compared to other lava flow types. Signup and view all the answers

How do pillow lavas form?

They form when lava erupts underwater and the surface skin cools quickly. Signup and view all the answers