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Viscous Lava Characteristics and Behavior

Viscous Lava Characteristics and Behavior

Assessment

Interactive Video

Science, Geography

9th - 12th Grade

Practice Problem

Hard

Created by

Aiden Montgomery

FREE Resource

The video tutorial covers the characteristics and behaviors of viscous magmas, focusing on different lava types such as blocky and silica-rich lavas. It explains the formation of obsidian flows and the crystallization processes in volcanic environments. The tutorial also discusses geological features like columnar jointing and introduces the Volcanic Explosivity Index (VEI), highlighting its importance in understanding volcanic eruptions.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a key characteristic of viscous lavas compared to basaltic lavas?

They flow more easily.

They are less explosive.

They are cooler in temperature.

They have a higher silica content.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Under what conditions can viscous lavas transition into blocky lavas?

When they cool rapidly.

When they are mixed with basalt.

When they are exposed to water.

When they become more viscous.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the significance of degassing in the context of silicic lava domes?

It reduces the viscosity of the lava.

It increases the explosiveness of eruptions.

It prevents the formation of blocky lavas.

It cools the lava more quickly.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of lava is most likely to form a dome structure?

Obsidian

Basaltic

Andesitic

Rhyolitic

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of lava flow is characterized by a glassy appearance and high viscosity?

Rhyolitic flow

Basaltic flow

Obsidian flow

Andesitic flow

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is crystallization challenging in highly viscous lavas?

Because they cool too quickly.

Because they are too hot.

Because they lack sufficient silica.

Because diffusion is limited.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which lava flow style is known for its smooth, ropy surface?

Aa

Pahoehoe

Obsidian

Blocky

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