TED-Ed: What makes volcanoes erupt? | Steven Anderson

The video explores the formation and eruption of the volcano Poku Teen, detailing how magma forms and remains beneath the Earth's surface due to geological factors. It discusses causes of eruptions, including increased magma pressure and natural processes like magma cooling. The video also covers how unloading and erosion can trigger eruptions, and how rock layers weaken due to tectonic activity. Finally, it highlights the challenges in predicting eruptions and the technologies used to study them.

What is the primary factor that keeps magma beneath the Earth's surface?

• The weight of the Earth's crust

• The presence of water in the magma

• The temperature of the magma

• The speed of tectonic plates

How do gas bubbles contribute to volcanic eruptions?

• They lower the magma's density and increase buoyancy

• They solidify the magma

• They decrease the magma's temperature

• They increase the magma's density

What is one natural cause of buoyant bubbles in magma?

• Absence of dissolved gases

• Decrease in magma temperature

• Increase in lithostatic pressure

• Cooling of magma

What is the process called when landslides trigger volcanic eruptions?

• Tectonic shifting

• Unloading

• Magma crystallization

• Hydrothermal alteration

How can climate change potentially increase volcanic activity?

• By decreasing atmospheric pressure

• By raising magma temperatures

• By causing glacial melt

• By increasing tectonic activity

What role do earthquakes play in volcanic eruptions?

• They increase magma temperature

• They decrease lithostatic pressure

• They create fissures for magma to escape

• They solidify the magma

Which technology helps scientists detect subterranean hotspots?

• Thermal imaging

• Seismic sensors

• Ultrasound technology

• Satellite imagery