Volcanic Eruptions

What causes volcanoes to erupt?

• Wind and rain

• Sunlight and clouds

• Earthquakes

• Heat and pressure in the mantle

What is the name of the substance formed when rocks slowly melt within the Earth?

• Dust

• Ash

• Lava

• Magma

Which type of eruption involves the decompression of gas within magma propelling it forward?

• Plinian

• Hawaiian

• Vulcanian

• Magmatic

Which type of eruption is characterized by the effusive eruption of very fluid basalt-type lavas with low gaseous content?

• Pelean

• Vulcanian

• Strombolian

• Hawaiian

What is the most explosive and powerful type of eruption?

• Hawaiian

• Strombolian

• Vulcanian

• Plinian

Which type of eruption is driven by the collapse of a lava dome that often creates large eruptive columns?

• Hawaiian

• Strombolian

• Pelean

• Vulcanian

What is the name of the molten rock or magma that erupts onto the surface?

• Volcanic dust

• Felsic lava

• Intermediate lava

• Lava

Which type of volcanic material is high in silica, aluminum, potassium, sodium, and calcium?

• Felsic lava

• Volcanic bombs

• Lava

• Volcanic dust

What is the smallest volcanic material that can be easily blown by the wind?

• Volcanic bombs

• Volcanic ash

• Cinders

• Volcanic dust

Which type of eruption occurs underwater?

• Strombolian

• Plinian

• Hawaiian

• Submarine