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Volcano A volcano is an opening in the Earth’s crust where lava comes out
Where to find volcanoesVolcanoes can be found in 3 general locations Divergent Boundaries Subduction boundaries Hot Spots
Divergent Boundaries At divergent boundaries, volcanoes are created as the plates slide apart. Iceland is a good example.
Subduction BoundariesWhen one plate subducts under another, a volcano is created. A good example is Mt. Fuji in Japan, Mt. St Helens in Washington and Aleutian islands in Alaska
Hot Spots Hot Spots are volcanoes that form in the middle of a tectonic plate. Hawaii is an example. As the plate moves, the hot spot stays in the same place, so a chain of islands is often created.
Kinds of Volcanoes There are 3 kinds of volcanoes Shield ConeCinder Cone Composite Cone
Shield Cone Volcano Shield Cone volcanoes are not very tall and formed by layers of lava. Quiet Eruptions
Cinder Cone Steep Volcano with explosive eruptions.Explosive eruptions caused by gas. Formed by layers of volcanic rock
Composite Cone Made of alternating layers of lava and rockAlternates in explosive eruption and quiet eruptions AKA Stratocones
Volcanic lava Mafic lava – dark, no gas, not explosive, thinFelsic lava – light, lots of gas, explosive, thick Pahoehoe – ropey cooled lava, usually from mafic lava Aa – thick, blocky cooled lava from felsic lava
Caldera vs. crater Vent – name of actual opening of volcanoCrater – surrounding area around vent. Caldera – a collapsed vent; after a volcano explodes, a huge opening left over from explosion.
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