Understanding Volcano Eruptions

What did Dionisio Pulido initially think the sound from his cornfield was?

• Thunder

• A flood

• An earthquake

• A landslide

What is the name of the volcano that formed in Dionisio Pulido's cornfield?

• Paracutín

• Krakatoa

• Mount St. Helens

• Vesuvius

What is lithostatic pressure?

• The pressure from magma pushing upwards

• The weight of the Earth's crust pushing down on magma

• The pressure from gas bubbles in magma

• The pressure from tectonic plates

What can cause an increase in magmastatic pressure?

• Formation of gas bubbles

• Erosion of rocks

• Tectonic plate movement

• Cooling of magma

What is one natural cause of buoyant bubbles in magma?

• Melting glaciers

• Tectonic activity

• Erosion of the Earth's crust

• New magma bringing gassy compounds

What is the process called when landslides trigger an eruption?

• Magmastatic pressure

• Unloading

• Hydrothermal alteration

• Lithostatic pressure

What can weaken the rock layer above magma?

• Increased lithostatic pressure

• Decreased magmastatic pressure

• Hydrothermal alteration

• Cooling magma

What technology helps detect subterranean hotspots?

• Spectrometers

• Thermal imaging

• Radar

• Seismographs

What can spectrometers analyze in relation to volcanoes?

• Rock strength

• Gas escaping magma

• Magma temperature

• Volcano shape

What is a concern for geologists regarding climate change and volcanoes?

• Increased volcanic activity due to glacial melt

• Decreased magmastatic pressure

• Increased tectonic activity

• Stronger rock layers