volcanoes and plate tectonics
The nature of volcanic eruptions
Intrusive igneous activity
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What is magma?
molten rock form beneath Earths Surface
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What are the primary factors that determine whether a volcano erupts explosively or quietly ?
Characteristics of the magma and the amount of dissolved gases in the magma.
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What is plutons?
the cooling and hardening of magma beneath the earths surface.
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What is lahar?
when water soaked volcanic ash and rock slide rapidly downhill.
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What is a Calderas?
a depression in a volcanic mountain
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The formation of magma depends on what several factors?
heat,pressure,and water content
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What is viscosity ?
is a substance's resistance to flow.
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How is plutons classified?
according to their size, shape, and relationship to surrounding rock layers
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What is sill?
is a pluton that forms where magma flow between parallel layers of sedimentary rock.
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What is a Lava Plateaus?
is a volcanic land form produced by repeated eruptions of very fluid,basaltic lava
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Most volcanoes form along what boundaries?
Divergent and Convergent Plates
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What are the three main volcanic type ?
shield volcanoes, cinder cones, and composite cones
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What are the three types of plutons?
sill, laccoliths, and dikes
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What is a Columnar rock?
are volcanic rocks that split into columns as the lava cools.
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What is a Batholiths ?
is a body of intrusive igneous rock that has a surface exposure of more than 100 square kilometers.
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What is the ring of fire ?
is the long belt of volcanoes that circles much of the Pacific Ocean
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What is pyroclastic Material ?
Particles produced in volcanic eruptions
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What is and dike?
is a pluton that forms when magma moves into fracture that cut across rock layers.
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What is a crater Lake?
is a body of water that occupies a bowl-shaped depression around the opening of an extinct or domain volcano.
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What is a composite Cones ?
is a large, nearly symmetrical volcanic mountain composed of layers of both lava and pyroclastic deposits.
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What is intraplate Volcanism ?
Volcanic activity that occurs within plates
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Mauna Loa is what type of volcanoes?
a Shield Volcanoes
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What is a laccolith?
is a lens shaped pluton that has pushed that overlying rock layers upward.
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What is a volcanic neck?
is a land form made of magma that hardened in a volcano's pipe and later was exposed by erosion.
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How is a shield Volcanoes produced ?
are produced by the accumulation of fluid basaltic lava
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