Pyroclastic flows

The video explains the components of volcanic eruptions, focusing on pyroclastic flows. These flows can reach high speeds and temperatures, causing significant destruction, as seen in the historical events at Pompeii and Herculaneum.

What are the primary materials expelled during a volcanic eruption?

• Ice, snow, and hail

• Sand, gravel, and mud

• Rock fragments, dust, and ash

• Lava, water, and steam

How fast can pyroclastic flows travel during a volcanic eruption?

• 10 kilometers per hour

• 50 kilometers per hour

• Several hundred kilometers per hour

• 1000 kilometers per hour

What is the maximum temperature that pyroclastic flows can reach?

• 1250°C

• 1000°C

• 750°C

• 500°C

Which natural phenomenon was primarily responsible for the destruction of Pompeii and Herculaneum?

• Lava flows

• Earthquakes

• Pyroclastic flows

• Falling ash

What was the main difference between the effects of pyroclastic flows and falling ash on Roman cities?

• Falling ash caused more fires

• Pyroclastic flows engulfed the cities

• Falling ash was more destructive

• Pyroclastic flows were slower but hotter