Volcanicity

What is volcanicity?

• The process by which molten rock, ash, and gases escape from below the Earth's surface

• The movement of tectonic plates

• The formation of mountains by erosion

• The process of weathering rocks by wind

Which of the following best describes an "active" volcano?

• A volcano that is currently erupting or likely to erupt soon

• A volcano that has never erupted

• A volcano that is covered in ice

• A volcano that is unlikely to erupt again

What is the main characteristic of a "dormant" volcano?

• It is erupting right now

• It is not erupting now but may erupt again

• It is underwater

• It is unlikely to erupt again

Which type of volcano is considered "extinct"?

• One that is erupting frequently

• One that is unlikely to erupt again

• One that is covered in vegetation

• One that is not erupting now but may erupt again

Explain the difference between a stratovolcano and a shield volcano using your own words.

• Stratovolcanoes are tall and steep, while shield volcanoes are broad and gently sloping.

• Stratovolcanoes are underwater, while shield volcanoes are always on land.

• Stratovolcanoes erupt only lava, while shield volcanoes erupt only ash.

• Stratovolcanoes are found only in cold regions, while shield volcanoes are found in hot regions.

What is a key characteristic of a stratovolcano (composite volcano)?

• Frequent, non-explosive eruptions

• Wide, gentle slopes

• Steep-sided, cone-shaped

• Thin, runny lava

Which volcano is given as an example of a shield volcano?

• Mount Vesuvius (Italy)

• Mount St. Helens (USA)

• Kilauea (Hawai’i)

• Mount Fuji (Japan)

Compare the eruption styles of shield volcanoes and stratovolcanoes. Which statement is correct?

• Shield volcanoes have explosive, dangerous eruptions.

• Stratovolcanoes have frequent, non-explosive eruptions.

• Shield volcanoes have frequent, non-explosive eruptions, while stratovolcanoes have explosive, dangerous eruptions.

• Both types have the same eruption style.

Why might a stratovolcano be considered more dangerous than a shield volcano?

• It has wide, gentle slopes.

• It erupts thin, runny lava.

• It has explosive, dangerous eruptions due to thick, sticky lava.

• It erupts more frequently.