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Understanding Volcanoes: How Do They Work?

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Understanding Volcanoes: How Do They Work?

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Questions and Answers

What is the main difference between magma and lava?

Magma and lava are the same thing
Magma is hotter than lava
Magma is found inside the Earth, while lava is on the surface (correct)
Magma is a solid rock, while lava is molten rock

Which type of volcano is characterized by gentle sloping sides and is formed by non-explosive eruptions?

Extinct volcanoes
Shield volcanoes (correct)
Composite volcanoes
Cinder cone volcanoes

What is a vent in the context of volcanoes?

The entrance of a volcano that ejects lava and ash (correct)
A dormant volcano
A type of lava flow
A volcanic ash cloud

Which of the following is NOT a characteristic of active volcanoes?

Their volcanic activity will last forever (C) Signup and view all the answers

What is a volcanic neck?

The solid remains of magma that filled the conduit of an extinct volcano (A) Signup and view all the answers

Which type of volcano is characterized by a small mountain with a slope of 20°-40°?

Cinder cone volcanoes (D) Signup and view all the answers

What causes the Earth's crust to break up into different plates or pieces?

Tectonic plate movement (D) Signup and view all the answers

What is the primary characteristic of a volcano?

A cone-shaped mountain or hill (B) Signup and view all the answers

What is the purpose of the vent in a volcano?

To release magma and associated gases, pyroclastic material, and ash (C) Signup and view all the answers

What is the purpose of the magma chamber in a volcano?

To store the molten rock that will eventually erupt (D) Signup and view all the answers

What is the purpose of the conduit in a volcano?

To provide a pathway for the magma to reach the surface (A) Signup and view all the answers