What is considered a volcano?

A volcano is an opening in a planet or moon's crust through which molten rock, hot gases, and other materials erupt. Volcanoes often form a hill or mountain as layers of rock and ash build up from repeated eruptions. Volcanoes are classified as active, dormant, or extinct.Apr 5, 2019

What are 3 characteristics of a volcano?

Characteristics of volcanoes

• A volcano is formed by eruptions of lava and ash.
• Volcanoes are usually cone shaped mountains or hills.
• When magma reaches the Earth's surface it is called lava. …
• Volcanic eruptions can happen at destructive and constructive boundaries , but not at conservative boundaries or collision zones .

What are the 4 types of a volcano?

Geologists generally group volcanoes into four main kinds—cinder cones, composite volcanoes, shield volcanoes, and lava domes.

What is not classified as a volcano?

Active Volcanoes A volcano is classified as active if it is currently erupting or is expected to erupt in the near future. Approximately 500 volcanoes on Earth are classified as active, not including volcanoes that are submerged under the oceans.

What are the 3 types of volcano?

The Three Classic Types of Volcanoes

• Cinder Cone Volcanoes.
• Composite Volcanoes (Stratovolcanoes)
• Shield Volcanoes.

What are the 5 structural features of volcano?

What are the five structural features of volcano?

• Craters. Craters form as the result of explosive eruptive activity at a volcanic vent where rock, magma, and other material is ejected leaving a conical void.
• Calderas. …
• Diatremes and Maars. …
• Lava Flows. …
• Lava Tubes. …
• Fumaroles. …
• Geothermal Features.

Nov 28, 2021

What are active volcanoes?

An active volcano is a volcano which is either erupting or is likely to erupt in the future. (ie. “The Hummock” in Bundaberg Australia 4670) An active volcano which is not currently erupting is known as a dormant volcano.

What are the 5 main types of volcanoes?

5 Types of Volcanoes

• Composite or Strato-volcanoes: A composite volcano is also known as strato-volcano because composite strata or layered structure is formed due to the eruptive material. …
• Where are composite volcanoes located? …
• Shield volcanoes: …
• Cinder cones: …
• Spatter cones: …
• Complex volcanoes: …
• Other Volcanoes.

What are the 5 main volcanoes?

The World's Five Most Active Volcanoes

• Intro. (Image credit: Jesse Allen) …
• Sangay, Ecuador — 94 years. (Image credit: Ecuador Ministry of Tourism) …
• Santa María, Guatemala — 101 years. (Image credit: dreamstime) …
• Stromboli, Italy — 108 years. …
• Mount Etna, Italy — 109 years. …
• Mount Yasur, Vanautu — 111 years.

Nov 2, 2010

What are the 2 classification of volcanoes?

There are two types of classification of volcanoes based on eruption and these are central or explosive and fissure or quiet. An explosive eruption happens because of a buildup of gas under very viscous slow flowing and thick magma.