Volanoes and Associated Hazards

What type of magma forms at constructive boundaries and hotspots over oceans?

• Basaltic magma

• Rhyolitic magma

• Dacitic magma

• Andesitic magma

Which type of volcano is more closely associated with shield volcanoes and lower-magnitude eruptions?

• Strato-volcano

• Shield volcano

• Cinder volcano

• Composite volcano

What is the main compound in magma that influences the explosiveness of eruptions?

• Sulfur dioxide

• Carbon dioxide

• Silica

• Hydrogen sulfide

What is the primary hazard that occurs when superheated gas, pumice, and ash fly down the flank of a volcano?

• Lahars

• Pyroclastic flows

• Lava flow

• Landslides

Which type of lava is smooth, billowy, and low in viscosity?

• Pahoehoe lava

• Basaltic lava

• Rhyolitic lava

• A'A lava

What type of volcano is more commonly associated with composite volcanoes in destructive plate boundaries?

• Cinder volcano

• Composite volcano

• Strato-volcano

• Shield volcano

Which gas emitted by volcanoes is potentially hazardous to people, animals, agriculture, and property?

• Nitrogen

• Oxygen

• Hydrogen sulfide

• Carbon dioxide

What is the secondary hazard linked to the structural collapse of a volcano that includes rock avalanches and lahars?

• Lava

• Ash fall

• Landslides

• Pyroclastic flows

What type of magma is cooler, has greater silica content, and produces more viscous lava?

• Dacitic magma

• Rhyolitic magma

• Andesitic magma

• Basaltic magma

What is the primary hazard that can reach speeds of several hundred km/hr and temperatures over 700 °C?

• Landslides

• Lava flow

• Pyroclastic flows

• Lahars