Extrusive Volcanic Features (Leaving Cert Geography): Flashcards
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What type of eruptions form most volcanic mountains?
What type of eruptions form most volcanic mountains?
Central vent eruptions are how most volcanic mountains form.
What are the three types of central vent volcanoes?
What are the three types of central vent volcanoes?
Composite, Dome, and Shield volcanoes are the three types.
Describe a composite volcano.
Describe a composite volcano.
It has layers of lava and pyroclastic material forming a cone.
What happens if a composite volcano's crater is blocked?
What happens if a composite volcano's crater is blocked?
The top can blow off, creating a caldera depression.
How are dome volcanoes characterized?
How are dome volcanoes characterized?
They are steep-sided, rounded, formed by slow acidic lava.
What can happen to the crater of a dome volcano?
What can happen to the crater of a dome volcano?
It can become blocked, leading to violent eruptions.
Describe a shield volcano's shape.
Describe a shield volcano's shape.
It has a wide base with shallow, sloping sides.
What type of lava forms a shield volcano?
What type of lava forms a shield volcano?
Fast-flowing basic lava erupts to create the shield volcano.
Where are shield volcanoes commonly found?
Where are shield volcanoes commonly found?
They are common at hotspots like Hawaii.
What causes violent eruptions in dome volcanoes?
What causes violent eruptions in dome volcanoes?
Blocked craters lead to pressure buildup and violent eruptions.