Define volcano how are volcanoes classified on the besis of their period of erution
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What is a volcano?
What are the main features of a volcano?
What are active, dormant and extinct volcanoes?
What are the different types of volcano?
Where are volcanoes located?
What is the Ring of Fire?
What are lahars and pyroclastic flows?
Why do people live close to volcanoes?
Case Studies
The 1980 eruption of Mount St Helens
The 1991 eruption of Mount Pinatubo
The 2000 eruption of Popocatepetl
The 2010 eruption of Eyjafjallojokull
The 2010 eruption of Mt Merapi
The 2010 eruption of Mt Merapi
Related Topics
Plate tectonics
Earthquakes
Mount Kilauea, The World's most active volcano is a shiled volcano.
( Source - C. Heliker - US Geological Survey)
What are the different types of volcano?
What are the three main volcanoes?CompositeShieldDome (Acid lava cones) Online Activities
[Online activities]: n Activities related to this topicVolcanoes - Fling the teacher gamePodcast
[Podcast]: n Audio file for playback on mobile devices and personal computers
What are the three main volcanoes?
There are three main types of volcano - composite or strato, shield and dome.
Composite Volcanoes
Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava. A pyroclastic flow is a superheated mixture of hot steam, ash, rock and dust. A pyroclastic flow can travel down the side of a volcano at very high speeds with temperatures over 400 degrees celsius. Composite volcanoes can rise over 8000 feet.

A simple cross section through a composite volcano
When composite volcanoes erupt they are explosive and pose a threat to nearby life and property. Eruptions are explosive due to the thick, highly viscous lava that is produced by composite cone volcanoes. This viscous lava has a lot to do with why they are shaped the way they are. The thick lava cannot travel far down the slope of the volcano before it cools.
Composite volcanoes are usually found at destructive plate margins. Examples of composite volcanoes include Mount Fuji (Japan), Mount St Helens (USA) and Mount Pinatubo (Philippines).
Shield Volcanoes
Shield volcanoes are low with gently sloping sides and are formed from layers of lava. Eruptions are typically non-explosive. Shield volcanoes produce fast flowing fluid [lava] that can flow for many miles. Eruptions tend to be frequent but relatively gentle. Although these eruptions destroy property, death or injury to humans rarely occurs.

A simple cross section through a shield volcano
Shield volcanoes are usually found at constructive boundaries and sometimes at volcanic hotspots. Examples of shield volcanoes include Mount Kilauea and Maunaloa on Hawaii.
The video below shows a lava flow from Mount Kilauea.
LAVA – Lava is the liquid rock (magma) that flows out of a volcano. Lava glows red hot to white hot as it flows.
ACTIVE VOLCANO – An active volcano is one that erupts regularly.
DORMANT VOLCANO – A dormant volcano is one that has not erupted for many years, although there is still some activity deep inside.
A fissure vent, also known as a volcanic fissure, eruption fissure or simply a fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is often a few metres wide and may be many kilometres long. ... Fissure vents are often part of the structure of shield volcanoes.
extinct volacanoes are called dead volcanoe
volcano-- a mountain or hilly tropical ,cronical, having a creter or can't through which lava, rock, fregments, hot vapour and gas are or have been erected from the Earth...
TYPES OF VOLCANOS:
cinder cone.
stravolcano.
Mount rainier.
Mount Fuji.
Lava dome.
Mauna loa.
FOUR MAJOR TYPES:
clinder cone volcano...
composite volcanos...
shield valcanos......
Lava domes.....
Hope this helps u....
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