Volcanoes: Formation, Types, and Activity

The video explores the dynamic nature of volcanoes, their formation, types, and the hazards they pose. It covers how volcanoes form due to mantle melting, the different types of volcanoes like cinder cones and stratovolcanoes, and the dangers such as pyroclastic flows and lahars. The video also discusses how volcanologists monitor volcanic activity to predict eruptions.

What percentage of Earth's surface is created by volcanoes?

• 60%

• 50%

• 80%

• 70%

What is the primary role of volcanologists?

• Mapping tectonic plates

• Predicting volcanic behavior

• Measuring ocean currents

• Studying sedimentary rocks

What is the primary cause of volcanism at divergent plate boundaries?

• Subduction

• Decompression melting

• Mantle plumes

• Water addition

Which type of volcano is known for its explosive eruptions and high silica content?

• Shield volcano

• Kimberlite pipe

• Cinder cone

• Composite volcano

What type of lava is associated with effusive eruptions?

• Felsic lava

• Mafic lava

• Intermediate lava

• Ultramafic lava

What is the main characteristic of a shield volcano?

• Steep slopes

• High gas content

• Explosive eruptions

• Runny basaltic lava

Which volcanic event is associated with the deadliest eruption in American history?

• Krakatoa

• Mount Saint Helens

• Mount Vesuvius

• Mount Pinatubo

What geological feature is often linked to mass extinction events?

• Mid-ocean ridges

• Shield volcanoes

• Flood basalts

• Cinder cones

What is a key characteristic of kimberlite pipes?

• Contain diamonds

• Form at mid-ocean ridges

• Erupt mafic lava

• Rich in silica

Which type of volcanic activity significantly impacts ocean chemistry?

• Sea floor volcanism

• Cinder cone eruptions

• Kimberlite pipe eruptions

• Composite volcano eruptions