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Geology Exam 1 Chapters 1-7 Questions and Answers $15.49   Add to cart

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Geology Exam 1 Chapters 1-7 Questions and Answers

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Magma with high silica content tends to be - Answer-very viscous magma with low silica content tends to be - Answer-very fluid submarine eruptions of volcanoes - Answer-form pillow basalts which type of volcano is commonly composed of andesite - Answer-composite volcano an igneous rock ...

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  • October 4, 2024
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  • PG - Professional Geologist
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Geology Exam 1 Chapters 1-7 Questions
and Answers
Magma with high silica content tends to be - Answer-very viscous

magma with low silica content tends to be - Answer-very fluid

submarine eruptions of volcanoes - Answer-form pillow basalts

which type of volcano is commonly composed of andesite - Answer-composite volcano

an igneous rock made of pyroclasts has a texture called - Answer-fragmental

the largest known shield volcanoes on Earth occur in - Answer-Hawaii

Mafic igneous rocks contain - Answer-50% silica, MG and iron

two minerals that crystallize out of magma on the continuous side - Answer-1)
plagioclase 2)potassium feldspar

Sill - Answer-condordant tabular intrusions (horizontal cuts)

dike - Answer-discordant tabular intrusions(vertical cuts)

obsidian is an igneous rock that - Answer-solidified very rapidly to form volcanic glass

the most common type of volcano is n the "ring of fire" is - Answer-composite volcano

a volcanic rock composed of olivine, pyroxene and plagioclase is a - Answer-mafic

volcanoes compromised mainly of pyroclasts are known as - Answer-cindercone

volcanic eruptions around the circum-pacific belt to be very ____ and form ___
volcanoes from which ___rocks form - Answer-explosive, composite, andesite

volcanoes and atmospheres - Answer-originally created from gases released from
volcanic eruption

volcanoes and hydrosphere - Answer-produced by condensation of volcanic water
vapor

volcanoes and biospheres - Answer--lava flows and ash weather to produce fertile soils
-violent eruptions can destroy all life
-lots of ash and gases at atmos can trigger rapid climate change and mass extinctions

, lava - Answer-produced when magma reaches earths surface. molten rock that is
extruded on earths , igneous

pyroclasts - Answer-rapidly cooled rock fragments from eruption

what forms extrusive igneous ricks and volcanoes - Answer-pyroclasts and lava flow

May 18,1980 - Answer-Mt. St. Helens erupted, North America plate was overriding part
of pacific ocean floowr.

geothermal energy - Answer-underground heat created steam or superheated water
can be dripped and conveyed into pipes for electrical use

violence of eruptions controlled by - Answer-dissolved gaes, viscosity (fluids resistance
to flow determines how readily gas escapes)

temp of lava solidification - Answer-700-1200

mafic lava produces which rock - Answer-basalt, low in siO2, low in silica

silicic lavas are high in __ and produce which rock - Answer-siO2 and produce rhyolite

lavas of intermediate composition form which rock - Answer-andesite

gases in volcanoes - Answer-most is steam and water vapor but also CO2, Sulfer
dioxide and hydrogen sulfide

gases and pyroclasts - Answer-during eruptions, expanding gases propel pyroclasts in
the atmos

pyroclastic fall - Answer-theyre transported by winds and eventually settle back down to
Earth

pyroclastic flow - Answer-mixture of gas and pyro thats so dense it hugs ground as it
rapidily flows down the volcano

3 types of extrusiverocks - Answer-rhyolite (high silica)
basalt (low silica)
andesite (intermediate silica)

extrusive textures - Answer-grain size, glassy, fine grained, porphyritic

grain size - Answer-most important.
rate of cooling and viscosity

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