Volcanoes: Types, Eruptions, and Safety Measures

The video discusses Mount Agung in Bali, its history of eruptions, and the dangers posed by volcanic activity. It explains the two main types of volcanoes: effusive and explosive, and details the processes leading to eruptions. The video highlights the hazards of pyroclastic flows and the importance of monitoring and predicting volcanic eruptions to ensure public safety.

When did Mount Agung last erupt before 2010?

• 1963

• 1953

• 1983

• 1973

What is the primary characteristic of red (effusive) volcanoes?

• They emit large amounts of ash.

• They produce fluid lava flows.

• They are found in subduction zones.

• They have explosive eruptions.

Which type of volcano is Mount Agung classified as?

• Cinder cone

• Shield

• Grey (explosive)

• Red (effusive)

What is the term for the underground reservoir of magma?

• Volcanic vent

• Magma chamber

• Lava chamber

• Tectonic plate

What happens when the magma is too viscous and blocks the volcanic vent?

• The magma cools down and solidifies.

• The pressure builds up and causes an explosive eruption.

• The volcano becomes dormant.

• The volcano releases only gases.

What are pyroclastic flows also known as?

• Lava flows

• Ash clouds

• Nuées ardentes

• Volcanic bombs

What is the temperature that pyroclastic flows can reach?

• 300 degrees

• 400 degrees

• 500 degrees

• 200 degrees

Where are grey (explosive) volcanoes typically found?

• Continental rifts

• Subduction zones

• Hotspots

• Mid-ocean ridges

Why are grey volcanoes considered more dangerous than red volcanoes?

• They produce less lava.

• Their eruptions are more violent and rapid.

• They are more common.

• Their eruptions are more predictable.

How do scientists help protect populations from volcanic eruptions today?

• By relocating entire cities.

• By cooling down the magma.

• By building barriers around volcanoes.

• By predicting eruptions and issuing timely alerts.