How Volcanoes Are Formed
Magma rises through cracks or weaknesses in the Earth's crust.
Pressure builds up inside the Earth.
When this pressure is released, as a result of plate movement for example, magma explodes to the surface causing a volcanic eruption.
The lava from the eruption cools to form new crust.
Over time, after several eruptions, the rock builds up and a volcano forms.
-Resembles a warriors shield
-Can vary in size- some shield volcanoes can be a few km, whereas some can have a diameter of up to 95 km
-In Hawaii, some have an altitude of 8000 meters above sea floor
which is 12000 above their base.
-Some of the largest Volcanoes on this planet are actually shield volcanoes
-For example, the Mauna Loa, located on Big Island in Hawaii, is the biggest of this type.
Examples of Shield Volcanoes
Mauna Loa- 4170m asl
Mauna Kea- 4205m asl
Kilauea- 1277m asl
Fernandina- 1476m asl
Rangitoto- 260 m aslBelknap- 2096m asl
Newberry- 2435m asl
Examples Of Stratovolcanoes
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Public - 4/13/16, 8:04 PM