There
are a few properties of an eruption that separate it from other eruptions.
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Effusive
eruptions are characterized by quiet, flowing lava. They show laminar
flow, in which the lava flows in an orderly manner. The lava flows
at the same speed in the same direction. These eruptions are common
with basaltic magmas.
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Explosive
eruptions are dominated by pyroclastics and more violent displays. They
show turbulent flow, in which the lava flows chaotically. When the
magma is more silicon rich, an explosive eruption is more likely. Water
and magma contact also causes more explosive eruptions.
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Conventional
eruptions are those in which there are not large quantities of water involved.
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Hydrovolcanic
eruptions are very aptly named for the fact that they involve water. They
are fairly common, as many volcanoes are located near oceans. Magma
and water react violently, and so hydrovolcanism is a spectacular site to
see.
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