Types Of Volcanos Flashcards
(5 cards)
Dome Volcanos- Destructive
Lava flows from a central vent
Acid lava quickly solidify
Steep sided, convex cone
Volcanos is made up of many layers
E.g mt St Helens, USA
Ash and cinder cones- Destructive
Fine ash and cinder is ejected from a central vent
Layers of ash and cinder built up
Shallow sided, concave sides
Volcano is made up of many layers
E.g Mt Etna, Italy
Caldera Volcano- Destructive
Gas builds up in the magma chamber causing an explosion
The sides of the crater upside
Craters can be flooded by the sea, creating lagoons
E.g Mt Mazama, USA
Fissure Eruptions- Constructive
When two plates move apart lava is ejected through fissures
Normally compromised by basalt
Lava fills up hollow rather than creating dome shape
The slow cooling of lava produces columnar jointing
E.g GiantsCauseway, N Ireland
Sheild Volcanos- Constructive
Lava flows from a central vent
Lava spreads over a large area before solidifying
Results in a cone with long gentle sides
Volcano is made up of many layers
E.g Mauna Loa, Hawaii