products of volcanoes Flashcards

1
Q

list of products

A

volcanic gas
lava flow
pyroclastic material

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2
Q

what is a volcano

A

a vent at the surface of the earth through which magma and other volcanic materials are ejected

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3
Q

what are characteristics of mafic lavas

A

low viscosity
thin
spread furthest

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4
Q

what are the two types of mafic lava?

A

aa

pahoehoe

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5
Q

what are characteristics of aa lava flow surfaces

A

rough blocky jagged surface

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6
Q

what are characteristics of pahoehoe lava flow surfaces

A

smooth or ropey surface

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7
Q

which out of aa and pahoehoe is more viscous

A

aa

pahoehoe is less viscous but becomes more viscous as it cools sometimes becoming aa lava

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8
Q

what are volcanic gases

A

gases dissolved in magma while under pressure at depth. when pressure decreases nearer suface, gases are released by an eruption

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9
Q

what do volcanic gases consist of

A

water vapor (ABOUT 70%)
CO2
N
SO2

gases combine with H and H2O to form toxic compounds. can cause acid rain near volcano

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10
Q

what are characteristics of intermediate and silicic lavas

A

viscous
short flow distance
can form domes within crater
often shows flow banding

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11
Q

what are pyroclastic materials?

A

magma forcefully/explosivley ejected into atmospere as particles calles pyroclasts

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12
Q

what are some pyroclasts

A
ash
lapilli
bombs and blocks
nuée ardentes
pumice- travels far, floats
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13
Q

what is volcanic ash

A

smallest particles (

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14
Q

what is lapilli?

A

particles 2-64mm

form lapilli tuff

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15
Q

what are bombs and blocks

A

coarsest particles >64 mm

form pyroclastic rock AGGLOMERATE around crater

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16
Q

what is a nuée ardent

A

gaseous magma that forms fast moving pyroclastic flows
flow for several KM
form the rock IGNIMBRITE