Introduction to volcanoes and their types
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Where did the name Volcano come from?
Vulcano, named after the roman god of fire, Vulcan
how many active volcanoes are in the world right now?
859 active volcanoes
How many % of active volcanoes are in the pacific ring of fire
75%
How many active volcanoes erupt atleast once yearly
50-60 volcanoes
How many volcanoes erupt at any given time
20
Volcanoes are categorized by? (3)
Shape Materials they are made of The way they erupt
Also called strato volcanotes
Composite volcanoes
Formed by attending layers of rock and lava fragments
Composite volcanoes
Are huge in size, built by many layers of runny lava
Shield volcano
A steep conical hill formed above a vent, among the most common volcanic landforms
Cinder cone
Cinder cones are chiefly formed by _________
Strombolian
Cinder cone are built from lava fragments called _________
Cinders
Also called lava dome
Volcanic dome
Is a rounded steep sided mound
Volcanic dome
Described to produce the largest eruptions on earth
Supervolcanoes
What is VEI
Volcanic explosivity index
Created when magma erupts underwater
Submarine volcanoes
Submarine volcanoes in the shallow water can eject basaltic magma and the lava formed is known as _______
Pillow lava
Also called glaciovolcano
Subglacial volcano
Subglacial eruptions often causes _________ or _______
Jokulhlaups or great ploods of water
Volcanoes are classified as (3)
Active, dormant, extinct
7 types of volcanoes
Composite volcanoes Shield volcanoes Cinder cone Volcanic dome Super volcanoes Submarine volcanoes Subglacial volcano
Created by eruptions beneath the surface of a glacier or sheets
Subglacial volcano