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Volcanoes: Types and Features

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Questions and Answers

What feature distinguishes a CRATER from a CALDERA at the summit of a volcano?

Rock formation

Explosive eruption

Funnel-shaped opening (correct)

Lava accumulation

How are SHIELD VOLCANOES mainly formed?

By accumulation of lava (correct)

By ejected lava fragments

By explosive eruptions

By weathering and erosion

Which type of volcano is characterized by a steep slope, wide crater, and abundant cinders?

Inactive Volcano

Caldera

Cinder Cone Volcano (correct)

Shield Volcano

What defines an ACTIVE VOLCANO based on its record of eruption?

Eruption over the last 600 years (D) Signup and view all the answers

How do CINDER CONE VOLCANOES differ from SHIELD VOLCANOES?

Steep slope vs. domed structure (A) Signup and view all the answers

What leads to the formation of a CALDERA at the summit of a volcano?

Wall collapse post-explosive eruption (C) Signup and view all the answers

What type of volcano is formed from the alternating solidification of lava and pyroclastic deposits?

Composite cone or stratovolcano (B) Signup and view all the answers

What is the key characteristic of a fissure volcano?

It has giant cracks that open in the ground to expel lava (A) Signup and view all the answers

What is the term used to describe the mixture of rock, mineral, and glass particles expelled from a volcano during an eruption?

Pyroclastic materials (C) Signup and view all the answers

Which type of pyroclastic material refers to igneous rocks that formed during a volcanic eruption and were blown into the air?

Tephra (D) Signup and view all the answers

What is the term used to describe the fine particles of rock powder that are blown out from a volcano and can remain suspended in the atmosphere for long periods?

Volcanic dust (C) Signup and view all the answers

What type of volcanic eruption is dominated by the outpouring of lava onto the ground?

Effusive type of eruption (A) Signup and view all the answers