Types of Volcanoes
This type of volcano has broad, gently sloping sides and erupts fluid lava.
What is a shield volcano?
The scale used to measure the intensity of volcanic eruptions.
What is the Volcanic Explosivity Index (VEI)?
Molten rock found beneath the Earth’s surface.
What is magma?
The bowl-shaped depression at the top of a volcano.
What is a Crater?
This region around the Pacific Ocean is known for frequent volcanic eruptions and earthquakes.
What is the Ring of Fire?
This steep-sided volcano is made of layers of lava and ash and has explosive eruptions.
What is a composite volcano?
The 1980 eruption of this U.S. volcano significantly changed its shape.
What is Mount St. Helens?
When magma reaches the Earth's surface, it is called this.
What is lava?
A large underground pool of molten rock that feeds a volcano.
What is a magma chamber?
The Hawaiian Islands were formed by this geological feature.
What is a Hot Spot?
This small, steep volcano is made mostly of volcanic fragments.
What is a cinder cone volcano?
This type of lava is thick and slow-moving due to its high silica content.
What is rhyolitic lava?
The type of magma with the lowest silica content, making it very fluid.
What is basaltic magma?
A vent that periodically erupts steam and hot water.
What is a geyser?
This underwater mountain range has many submarine volcanoes.
What is the Mid-Atlantic Ridge?
This volcano is currently inactive but may erupt again in the future.
What is a dormant volcano?
This term refers to a mix of hot gas, ash, and rock that flows rapidly down a volcano.
What is a pyroclastic flow?
The smooth, rope-like lava found in Hawaii.
What is pahoehoe?
A volcanic gas vent that releases steam and sulfur gases.
What is a Fumarole?
This Indonesian volcano's 1883 eruption was one of the loudest sounds recorded in history.
What is Krakatoa?
This type of volcano is unlikely to erupt again.
What is an extinct volcano?
This volcanic hazard occurs when volcanic ash and debris mix with water, creating a fast-moving mudflow.
What is a Lahar?
The rough, jagged lava that forms when lava cools quickly.
What is 'a’a lava?
The type of igneous rock that forms when magma cools inside the Earth.
What is an intrusive rock?
This massive supervolcano in the United States could cause widespread destruction if it erupts.
What is the Yellowstone Caldera?