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Volcanic Eruptions and Lava Types

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Questions and Answers

What type of volcanic activity is associated with a cone-shaped mountain or hill created by molten material?

Effusive eruption (correct)

Explosive eruption

Strombolian eruption

Phreatomagmatic eruption

Which of the following is NOT a part of a volcano's structure?

Vent

Magma chamber

Conduit

Sill (correct)

What is the term for the molten rock beneath the Earth's surface?

Lava

Pyroclastic

Ash

Magma (correct)

What is the opening in the Earth's surface through which volcanic materials escape?

Vent Signup and view all the answers

What type of volcano is formed by an accumulation of volcanic debris?

Parasitic cone Signup and view all the answers

Which of the following is a more or less vertical, sheet-like magma body that cuts through older rocks or sediments?

Dike or Dyke Signup and view all the answers

Which of the following statements about magma and lava is correct?

Magma is the hot molten rock coming from the mantle, while lava is the molten rock that erupts from a volcano. Signup and view all the answers

What is the vent of a volcano?

The entrance of a volcano, where lava and volcanic ash are ejected. Signup and view all the answers

Which of the following best describes an active volcano?

A volcano that is erupting or has erupted recently and is expected to erupt again in the near future. Signup and view all the answers

What is a dormant volcano?

A quiet volcano that is not active now, but may become active again in the future. Signup and view all the answers

Which of the following best describes an extinct volcano?

A volcano that is at the end of its life and is no longer able to erupt. Signup and view all the answers

Which of the following is a type of volcano based on its shape?

Cinder cone volcano Signup and view all the answers

What type of volcano is Paricutin in Mexico?

Composite volcano Signup and view all the answers

What is the maximum height of a composite volcano?

3000 meters Signup and view all the answers

What is the primary composition of the lava in a composite volcano?

Granitic Signup and view all the answers

What happens during a quiet eruption of a composite volcano?

Lava flows cover the sides of the cone Signup and view all the answers

What is the main difference between an explosive and an effusive/nonexplosive eruption?

The amount of pressure released Signup and view all the answers

Why does the lava fragment burst into the air and fall around the vent of a volcano?

Because there is only one vent for the magma to escape Signup and view all the answers